[ESP32 Only] Bluetooth® Low Energy AT Commands

[中文]

ESP32 AT firmware supports Bluetooth® Core Specification Version 5.0.

  • [ESP32 Only] AT+BLEINIT: Bluetooth LE initialization.
  • [ESP32 Only] AT+BLEADDR: Query/Set Bluetooth LE device address.
  • [ESP32 Only] AT+BLENAME: Query/Set Bluetooth LE device name.
  • [ESP32 Only] AT+BLESCANPARAM: Query/Set parameters of Bluetooth LE scanning.
  • [ESP32 Only] AT+BLESCAN: Enable Bluetooth LE scanning.
  • [ESP32 Only] AT+BLESCANRSPDATA: Set Bluetooth LE scan response.
  • [ESP32 Only] AT+BLEADVPARAM: Query/Set parameters of Bluetooth LE advertising.
  • [ESP32 Only] AT+BLEADVDATA: Set Bluetooth LE advertising data.
  • [ESP32 Only] AT+BLEADVDATAEX: Automatically set Bluetooth LE advertising data.
  • [ESP32 Only] AT+BLEADVSTART: Start Bluetooth LE advertising.
  • [ESP32 Only] AT+BLEADVSTOP: Stop Bluetooth LE advertising.
  • [ESP32 Only] AT+BLECONN: Establish Bluetooth LE connection.
  • [ESP32 Only] AT+BLECONNPARAM: Query/Update parameters of Bluetooth LE connection.
  • [ESP32 Only] AT+BLEDISCONN: End Bluetooth LE connection.
  • [ESP32 Only] AT+BLEDATALEN: Set Bluetooth LE data packet length.
  • [ESP32 Only] AT+BLECFGMTU: Set Bluetooth LE MTU length.
  • [ESP32 Only] AT+BLEGATTSSRVCRE: Generic Attributes Server (GATTS) creates services.
  • [ESP32 Only] AT+BLEGATTSSRVSTART: GATTS starts services.
  • [ESP32 Only] AT+BLEGATTSSRVSTOP: GATTS Stops Services.
  • [ESP32 Only] AT+BLEGATTSSRV: GATTS discovers services.
  • [ESP32 Only] AT+BLEGATTSCHAR: GATTS discovers characteristics.
  • [ESP32 Only] AT+BLEGATTSNTFY: Notify a client of the value of a characteristic value from the server.
  • [ESP32 Only] AT+BLEGATTSIND: Indicate the characteristic value from the server to a client.
  • [ESP32 Only] AT+BLEGATTSSETATTR: GATTS sets characteristics.
  • [ESP32 Only] AT+BLEGATTCPRIMSRV: Generic Attributes Client (GATTC) discovers primary services.
  • [ESP32 Only] AT+BLEGATTCINCLSRV: GATTC discovers included services.
  • [ESP32 Only] AT+BLEGATTCCHAR: GATTC discovers characteristics.
  • [ESP32 Only] AT+BLEGATTCRD: GATTC reads characteristics.
  • [ESP32 Only] AT+BLEGATTCWR: GATTC writes characteristics.
  • [ESP32 Only] AT+BLESPPCFG: Query/Set Bluetooth LE SPP parameters.
  • [ESP32 Only] AT+BLESPP: Enter Bluetooth LE SPP mode.
  • [ESP32 Only] AT+BLESECPARAM: Query/Set Bluetooth LE encryption parameters.
  • [ESP32 Only] AT+BLEENC: Initiate Bluetooth LE encryption request.
  • [ESP32 Only] AT+BLEENCRSP: Respond to the pairing request from the peer device.
  • [ESP32 Only] AT+BLEKEYREPLY: Reply the key value to the peer device in the legacy connection stage.
  • [ESP32 Only] AT+BLECONFREPLY: Reply the confirm value to the peer device in the legacy connection stage.
  • [ESP32 Only] AT+BLEENCDEV: Query bonded Bluetooth LE encryption device list.
  • [ESP32 Only] AT+BLEENCCLEAR: Clear Bluetooth LE encryption device list.
  • [ESP32 Only] AT+BLESETKEY: Set Bluetooth LE static pair key.
  • [ESP32 Only] AT+BLEHIDINIT: Bluetooth LE Human Interface Device (HID) profile initialization.
  • [ESP32 Only] AT+BLEHIDKB: Send Bluetooth LE HID keyboard information.
  • [ESP32 Only] AT+BLEHIDMUS: Send Bluetooth LE HID mouse information.
  • [ESP32 Only] AT+BLEHIDCONSUMER: Send Bluetooth LE HID consumer information.
  • [ESP32 Only] AT+BLUFI: Start or Stop BluFi.
  • [ESP32 Only] AT+BLUFINAME: Query/Set BluFi device name.

[ESP32 Only] AT+BLEINIT: Bluetooth LE Initialization

Query Command

Function:

Check the initialization status of Bluetooth LE.

Command:

AT+BLEINIT?

Response:

If Bluetooth LE is initialized, AT will return:

+BLEINIT:<role>
OK

If Bluetooth LE is not initialized, AT will return:

+BLEINIT:0
OK

Set Command

Function:

Initialize the role of Bluetooth LE.

Command:

AT+BLEINIT=<init>

Response:

OK

Parameter

  • <init>:
    • 0: deinit Bluetooth LE
    • 1: client role
    • 2: server role

Notes

  • The file “at_customize.bin” has to be downloaded, so that the relevant commands can be used. Please refer to How to Customize Bluetooth® LE Services for more details.
  • Before using other Bluetooth LE AT commands, you should run this command first to trigger the initialization process.
  • After the initialization, the Bluetooth LE role cannot be changed unless you run AT+RST to restart the system first and then re-initialize the Bluetooth LE role.
  • If you use an ESP device as a Bluetooth LE server, a service bin should be downloaded into flash.
    • To learn how to generate a service bin, please refer to esp-at/tools/readme.md.
    • The download address of the service bin is the “ble_data” address in esp-at/module_config/module_${platform}_default/at_customize.csv.

Example

AT+BLEINIT=1

[ESP32 Only] AT+BLEADDR: Query/Set Bluetooth LE Device Address

Query Command

Function:

Query the Bluetooth LE Public Address.

Command:

AT+BLEADDR?

Response:

+BLEADDR:<BLE_public_addr>
OK

Set Command

Function:

Set the Bluetooth LE address type.

Command:

AT+BLEADDR=<addr_type>[,<random_addr>]

Response:

OK

Parameter

  • <addr_type>:
    • 0: Public Address
    • 1: Random Address

Note

  • A Static Address should meet the following requirements:
    • The two most significant bits of the address should be equal to 1.
    • At least one bit of the random part of the address should be 0.
    • At least one bit of the random part of the address should be 1.

Example

AT+BLEADDR=1,"f8:7f:24:87:1c:7b"    // Set Random Device Address, Static Address
AT+BLEADDR=1                        // Set Random Device Address, Private Address
AT+BLEADDR=0                        // Set Public Device Address

[ESP32 Only] AT+BLENAME: Query/Set Bluetooth LE Device Name

Query Command

Function:

Query the Bluetooth LE device name.

Command:

AT+BLENAME?

Response:

+BLENAME:<device_name>
OK

Set Command

Function:

Set the Bluetooth LE device name.

Command:

AT+BLENAME=<device_name>

Response:

OK

Parameter

  • <device_name>: the Bluetooth LE device name. The maximum length is 32. Default: “BLE_AT”.

Note

  • The configuration changes will be saved in the NVS area if AT+SYSSTORE=1.

Example

AT+BLENAME="esp_demo"

[ESP32 Only] AT+BLESCANPARAM: Query/Set Parameters of Bluetooth LE Scanning

Query Command

Function:

Query the parameters of Bluetooth LE scanning.

Command:

AT+BLESCANPARAM?

Response:

+BLESCANPARAM:<scan_type>,<own_addr_type>,<filter_policy>,<scan_interval>,<scan_window>
OK

Set Command

Function:

Set the parameters of Bluetooth LE scanning.

Command:

AT+BLESCANPARAM=<scan_type>,<own_addr_type>,<filter_policy>,<scan_interval>,<scan_window>

Response:

OK

Parameters

  • <scan_type>:
    • 0: passive scan
    • 1: active scan
  • <own_addr_type>:
    • 0: Public Address
    • 1: Random Address
    • 2: RPA Public Address
    • 3: RPA Random Address
  • <filter_policy>:
    • 0: BLE_SCAN_FILTER_ALLOW_ALL
    • 1: BLE_SCAN_FILTER_ALLOW_ONLY_WLST
    • 2: BLE_SCAN_FILTER_ALLOW_UND_RPA_DIR
    • 3: BLE_SCAN_FILTER_ALLOW_WLIST_PRA_DIR
  • <scan_interval>: scan interval
  • <scan_window>: scan window

Note

  • The parameter <scan_window> CANNOT be larger than <scan_interval>.

Example

AT+BLEINIT=1   // role: client
AT+BLESCANPARAM=0,0,0,100,50

[ESP32 Only] AT+BLESCAN: Enable Bluetooth LE Scanning

Set Command

Function:

Enable/disable scanning.

Command:

AT+BLESCAN=<enable>[,<interval>][,<filter_type>,<filter_param>]

Response:

+BLESCAN:<addr>,<rssi>,<adv_data>,<scan_rsp_data>,<addr_type>
OK

Parameters

  • <enable>:

    • 1: enable continuous scanning.
    • 0: disable continuous scanning.
  • [<interval>]: optional parameter. Unit: second.

    • If you want to disable the scanning, this parameter should be omitted.
    • If you want to enable the scanning, set a value for this parameter:
    • When you set it to 0, it means that scanning is continuous.
    • When set it to a value other than 0, for example, AT+BLESCAN=1,3, it means that scanning will last for 3 seconds and then stop automatically. The scanning results will be returned.
  • [<filter_type>]: filtering option.

    • 1: “MAC”.
    • 2: “NAME”.
  • <filter_param>: filtering parameter showing the remote device MAC address or remote device name.

  • <addr>: Bluetooth LE address.

  • <rssi>: signal strength.

  • <adv_data>: advertising data.

  • <scan_rsp_data>: scan response data.

  • <addr_type>: the address type of broadcasters.

Notes

  • The response OK does not necessarily come before the response +BLESCAN:<addr>,<rssi>,<adv_data>,<scan_rsp_data>,<addr_type>. It may be output before +BLESCAN:<addr>,<rssi>,<adv_data>,<scan_rsp_data>,<addr_type> or after it.

Example

AT+BLEINIT=1    // role: client
AT+BLESCAN=1    // start scanning
AT+BLESCAN=0    // stop scanning
AT+BLESCAN=1,3,1,"24:0A:C4:96:E6:88"  // start scanning, filter type is MAC address
AT+BLESCAN=1,3,2,"ESP-AT"  // start scanning, filter type is device name

[ESP32 Only] AT+BLESCANRSPDATA: Set Bluetooth LE Scan Response

Set Command

Function:

Set scan response.

Command:

AT+BLESCANRSPDATA=<scan_rsp_data>

Response:

OK

Parameter

  • <scan_rsp_data>: scan response data is a HEX string. For example, if you want to set the response data to “0x11 0x22 0x33 0x44 0x55”, the command should be AT+BLESCANRSPDATA="1122334455".

Example

AT+BLEINIT=2   // role: server
AT+BLESCANRSPDATA="1122334455"

[ESP32 Only] AT+BLEADVPARAM: Query/Set Parameters of Bluetooth LE Advertising

Query Command

Function:

Query the parameters of advertising.

Command:

AT+BLEADVPARAM?

Response:

+BLEADVPARAM:<adv_int_min>,<adv_int_max>,<adv_type>,<own_addr_type>,<channel_map>,<adv_filter_policy>,<peer_addr_type>,<peer_addr>
OK

Set Command

Function:

Set the parameters of advertising.

Command:

AT+BLEADVPARAM=<adv_int_min>,<adv_int_max>, <adv_type>,<own_addr_type>,<channel_map>[,<adv_filter_policy>][,<peer_addr_type>] [,<peer_addr>]

Response:

OK

Parameters

  • <adv_int_min>: minimum advertising interval. It should be less than or equal to the value of <adv_int_max>. Range: 0x0020 ~ 0x4000.
  • <adv_int_max>: maximum advertising interval. It should be more than or equal to the value of <adv_int_min>. Range: 0x0020 ~ 0x4000.
  • <adv_type>:
    • 0: ADV_TYPE_IND
    • 1: ADV_TYPE_DIRECT_IND_HIGH
    • 2: ADV_TYPE_SCAN_IND
    • 3: ADV_TYPE_NONCONN_IND
    • 4: ADV_TYPE_DIRECT_IND_LOW
  • <own_addr_type>: own Bluetooth LE address type.
    • 0: BLE_ADDR_TYPE_PUBLIC
    • 1: BLE_ADDR_TYPE_RANDOM
  • <channel_map>: channel of advertising.
    • 1: ADV_CHNL_37
    • 2: ADV_CHNL_38
    • 4: ADV_CHNL_39
    • 7: ADV_CHNL_ALL
  • [<adv_filter_policy>]: filter policy of advertising.
    • 0: ADV_FILTER_ALLOW_SCAN_ANY_CON_ANY
    • 1: ADV_FILTER_ALLOW_SCAN_WLST_CON_ANY
    • 2: ADV_FILTER_ALLOW_SCAN_ANY_CON_WLST
    • 3: ADV_FILTER_ALLOW_SCAN_WLST_CON_WLST
  • [<peer_addr_type>]: remote Bluetooth LE address type.
    • 0: PUBLIC
    • 1: RANDOM
  • [<peer_addr>]: remote Bluetooth LE address.

Notes

  • Advertising interval shall be an integer multiple of 0.625 ms in the range of 20 ms to 10.24 s.

Example

AT+BLEINIT=2   // role: server
AT+BLEADVPARAM=50,50,0,0,4,0,0,"12:34:45:78:66:88"

[ESP32 Only] AT+BLEADVDATA: Set Bluetooth LE Advertising Data

Set Command

Function:

Set advertising data.

Command:

AT+BLEADVDATA=<adv_data>

Response:

OK

Parameter

  • <adv_data>: advertising data in HEX string. For example, to set the advertising data to “0x11 0x22 0x33 0x44 0x55”, the command should be AT+BLEADVDATA="1122334455".

Note

  • If advertising data is preset by command AT+BLEADVDATAEX=<dev_name>,<uuid>,<manufacturer_data>,<include_power>, it will be overwritten by this command.

Example

AT+BLEINIT=2   // role: server
AT+BLEADVDATA="1122334455"

[ESP32 Only] AT+BLEADVDATAEX: Automatically Set Bluetooth LE Advertising Data

Query Command

Function:

Query the parameters of advertising data.

Command:

AT+BLEADVDATAEX?

Response:

+BLEADVDATAEX:<dev_name>,<uuid>,<manufacturer_data>,<include_power>

OK

Set Command

Function:

Set the advertising data and start advertising.

Command:

AT+BLEADVDATAEX=<dev_name>,<uuid>,<manufacturer_data>,<include_power>

Response:

OK

Parameters

  • <dev_name>: string parameter showing a device name. For example, if you want to set the device name to “just-test”, the command should be AT+BLEADVSTARTEX="just-test",<uuid>,<manufacturer_data>,<include_power>.
  • <uuid>: string parameter. For example, if you want to set the UUID to “0xA002”, the command should be AT+BLEADVSTARTEX=<dev_name>,"A002",<manufacturer_data>,<include_power>.
  • <manufacturer_data>: manufacturer data in HEX string. For example, if you set the manufacturer data to “0x11 0x22 0x33 0x44 0x55”, the command should be AT+BLEADVSTARTEX=<dev_name>,<uuid>,"1122334455",<include_power>.
  • <include_power>: If you need to include the TX power in the advertising data, you should set the parameter to 1. Otherwise, set it to 0.

Note

  • If advertising data is preset by command AT+BLEADVDATA=<adv_data>, it will be overwritten by this command.

Example

AT+BLEINIT=2   // role: server
AT+BLEADVDATAEX="ESP-AT","A002","0102030405",1

[ESP32 Only] AT+BLEADVSTART: Start Bluetooth LE Advertising

Execute Command

Function:

Start advertising.

Command:

AT+BLEADVSTART

Response:

OK

Notes

  • If advertising parameters are NOT set by command AT+BLEADVPARAM=<adv_parameter>, the default parameters will be used.
  • If advertising data is NOT set by command AT+BLEADVDATA=<adv_data>, the advertising playload will be empty.
  • If advertising data is preset by command AT+BLEADVDATA=<adv_data>, it will be overwritten by AT+BLEADVDATAEX=<dev_name>,<uuid>,<manufacturer_data>,<include_power> and vice versa.

Example

AT+BLEINIT=2   // role: server
AT+BLEADVSTART

[ESP32 Only] AT+BLEADVSTOP: Stop Bluetooth LE Advertising

Execute Command

Function:

Stop advertising.

Command:

AT+BLEADVSTOP

Response:

OK

Note

  • After the start of advertising, if the Bluetooth LE connection is established successfully, it will stop advertising automatically. In such a case, this command does NOT need to be called.

Example

AT+BLEINIT=2   // role: server
AT+BLEADVSTART
AT+BLEADVSTOP

[ESP32 Only] AT+BLECONN: Establish Bluetooth LE Connection

Query Command

Function:

Query the Bluetooth LE connection.

Command:

AT+BLECONN?

Response:

+BLECONN:<conn_index>,<remote_address>
OK

If the connection has not been established, there will be no <conn_index> and <remote_address> in the response.

Set Command

Function:

Establish the Bluetooth LE connection.

Command:

AT+BLECONN=<conn_index>,<remote_address>[,<addr_type>,<timeout>]

Response:

If the connection is established successfully, it will prompt:

+BLECONN:<conn_index>,<remote_address>

OK

If the connection fails, it will prompt:

+BLECONN:<conn_index>,-1

ERROR

If the connection fails due to parameters error or other reasons, it will prompt:

ERROR

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <remote_address>: remote Bluetooth LE address.
  • [<addr_type>]: the address type of broadcasters.
  • [<timeout>]: the timeout for the connection command. Unit: second. Range: [3,30].

Notes

  • It is recommended to scan devices by running AT+BLESCAN before initiating a new connection to ensure that the target device is in the broadcast state.
  • The maximum timeout for connection is 30 seconds.
  • If the Bluetooth LE server is initialized and the connection is established successfully, you can use this command to discover the services in the peer device (GATTC). The following GATTC commands can also be used:

Example

AT+BLEINIT=1   // role: client
AT+BLECONN=0,"24:0a:c4:09:34:23",0,10

[ESP32 Only] AT+BLECONNPARAM: Query/Update Parameters of Bluetooth LE Connection

Query Command

Function:

Query the parameters of Bluetooth LE connection.

Command:

AT+BLECONNPARAM?

Response:

+BLECONNPARAM:<conn_index>,<min_interval>,<max_interval>,<cur_interval>,<latency>,<timeout>
OK

Set Command

Function:

Update the parameters of Bluetooth LE connection.

Command:

AT+BLECONNPARAM=<conn_index>,<min_interval>,<max_interval>,<latency>,<timeout>

Response:

OK

If the setting fails, it will prompt the message below:

+BLECONNPARAM: <conn_index>,-1

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <min_interval>: minimum connecting interval. Range: 0x0006 ~ 0x0C80.
  • <max_interval>: maximum connecting interval. Range: 0x0006 ~ 0x0C80.
  • <cur_interval>: current connecting interval.
  • <latency>: latency. Range: 0x0000 ~ 0x01F3.
  • <timeout>: timeout. Range: 0x000A ~ 0x0C80.

Note

  • This command only supports the client role when updating its connection parameters. Of course, the connection has to be established first.

Example

AT+BLEINIT=1   // role: client
AT+BLECONN=0,"24:0a:c4:09:34:23"
AT+BLECONNPARAM=0,12,14,1,500

[ESP32 Only] AT+BLEDISCONN: End Bluetooth LE Connection

Execute Command

Function:

End the Bluetooth LE connection.

Command:

AT+BLEDISCONN=<conn_index>

Response:

OK  // The AT+BLEDISCONN command is received.
+BLEDISCONN:<conn_index>,<remote_address>  // The command is successful.

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <remote_address>: remote Bluetooth LE address.

Note

  • Only clients can call this command to terminate the connection.

Example

AT+BLEINIT=1   // role: client
AT+BLECONN=0,"24:0a:c4:09:34:23"
AT+BLEDISCONN=0

[ESP32 Only] AT+BLEDATALEN: Set Bluetooth LE Data Packet Length

Set Command

Function:

Set the length of Bluetooth LE data packet.

Command:

AT+BLEDATALEN=<conn_index>,<pkt_data_len>

Response:

OK

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <pkt_data_len>: data packet’s length. Range: 0x001b ~ 0x00fb.

Note

  • The Bluetooth LE connection has to be established first.

Example

AT+BLEINIT=1   // role: client
AT+BLECONN=0,"24:0a:c4:09:34:23"
AT+BLEDATALEN=0,30

[ESP32 Only] AT+BLECFGMTU: Set Bluetooth LE MTU Length

Query Command

Function:

Query the length of the maximum transmission unit (MTU).

Command:

AT+BLECFGMTU?

Response:

+BLECFGMTU:<conn_index>,<mtu_size>
OK

Set Command

Function:

Set the length of the maximum transmission unit (MTU).

Command:

AT+BLECFGMTU=<conn_index>,<mtu_size>

Response:

OK  // The command is received.

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <mtu_size>: MTU length.

Notes

  • Bluetooth LE connection has to be established first.
  • Only the client can call this command to set the length of MTU.
  • The actual length of MTU needs to be negotiated. The OK response only indicates an attempt to negotiate the length. The actual length may not be the value you set. Therefore, it is recommended to run command AT+BLECFGMTU? to query the actual length.

Example

AT+BLEINIT=1   // role: client
AT+BLECONN=0,"24:0a:c4:09:34:23"
AT+BLECFGMTU=0,300

[ESP32 Only] AT+BLEGATTSSRVCRE: GATTS Creates Services

Execute Command

Function:

The Generic Attributes Server (GATTS) creates Bluetooth LE services.

Command:

AT+BLEGATTSSRVCRE

Response:

OK

Notes

  • If you are using an ESP device as a Bluetooth LE server, a service bin should be downloaded into flash in order to provide services.
    • To learn how to generate a service bin, please refer to esp-at/tools/readme.md.
    • The download address of the service bin is the “ble_data” address in esp-at/module_config/module_${platform}_default/at_customize.csv.
  • This command should be called immediately to create services, right after the Bluetooth LE server is initialized; If a Bluetooth LE connection is established first, the service creation will fail.
  • If the Bluetooth LE client is initialized, you can use this command to create local services. Some GATTS commands can also be used, such as those to start and stop services, set attribute values, and send notifications/indications. See the list below for the specific commands.

Example

AT+BLEINIT=2   // role: server
AT+BLEGATTSSRVCRE

[ESP32 Only] AT+BLEGATTSSRVSTART: GATTS Starts Services

Execute Command

Function:

GATTS starts all services.

Command:

AT+BLEGATTSSRVSTART

Set Command

Function:

GATTS starts a specific service.

Command:

AT+BLEGATTSSRVSTART=<srv_index>

Response:

OK

Parameter

  • <srv_index>: service’s index starting from 1.

Example

AT+BLEINIT=2   // role: server
AT+BLEGATTSSRVCRE
AT+BLEGATTSSRVSTART

[ESP32 Only] AT+BLEGATTSSRVSTOP: GATTS Stops Services

Execute Command

Function:

GATTS stops all services.

Command:

AT+BLEGATTSSRVSTOP

Set Command

Function:

GATTS stops a specific service.

Command:

AT+BLEGATTSSRVSTOP=<srv_index>

Response:

OK

Parameter

  • <srv_index>: service’s index starting from 1.

Example

AT+BLEINIT=2   // role: server
AT+BLEGATTSSRVCRE
AT+BLEGATTSSRVSTART
AT+BLEGATTSSRVSTOP

[ESP32 Only] AT+BLEGATTSSRV: GATTS Discovers Services

Query Command

Function:

GATTS discovers services.

Command:

AT+BLEGATTSSRV?

Response:

+BLEGATTSSRV:<srv_index>,<start>,<srv_uuid>,<srv_type>
OK

Parameters

  • <srv_index>: service’s index starting from 1.
  • <start>:
    • 0: the service has not started.
    • 1: the service has already started.
  • <srv_uuid>: service’s UUID.
  • <srv_type>: service’s type.
    • 0: not primary service.
    • 1: primary service.

Example

AT+BLEINIT=2   // role: server
AT+BLEGATTSSRVCRE
AT+BLEGATTSSRV?

[ESP32 Only] AT+BLEGATTSCHAR: GATTS Discovers Characteristics

Query Command

Function:

GATTS discovers characteristics.

Command:

AT+BLEGATTSCHAR?

Response:

The response for a characteristic:

+BLEGATTSCHAR:"char",<srv_index>,<char_index>,<char_uuid>,<char_prop>

The response for a descriptor:

+BLEGATTSCHAR:"desc",<srv_index>,<char_index>,<desc_index>
OK

Parameters

  • <srv_index>: service’s index starting from 1.
  • <char_index>: characteristic’s index starting from 1.
  • <char_uuid>: characteristic’s UUID.
  • <char_prop>: characteristic’s properties.
  • <desc_index>: descriptor’s index.
  • <desc_uuid>: descriptor’s UUID.

Example

AT+BLEINIT=2   // role: server
AT+BLEGATTSSRVCRE
AT+BLEGATTSSRVSTART
AT+BLEGATTSCHAR?

[ESP32 Only] AT+BLEGATTSNTFY: Notify a Client of the Value of a Characteristic Value from the Server

Set Command

Function:

Notify a client of the value of a characteristic value from the server.

Command:

AT+BLEGATTSNTFY=<conn_index>,<srv_index>,<char_index>,<length>

Response:

>

The symbol > indicates that AT is ready for receiving serial data, and you can enter data now. When the requirement of data length determined by the parameter <length> is met, the notification starts.

If the data transmission is successful, AT returns:

OK

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <srv_index>: service’s index. It can be fetched with command AT+BLEGATTSCHAR?.
  • <char_index>: characteristic’s index. It can be fetched with command AT+BLEGATTSCHAR?.
  • <length>: data length.

Example

AT+BLEINIT=2      // Role: server.
AT+BLEGATTSSRVCRE
AT+BLEGATTSSRVSTART
AT+BLEADVSTART    // Start advertising. After the client is connected, it must be configured to receive notifications.
AT+BLEGATTSCHAR?  // Query the characteristics which the client will be notified of.
// For example, to notify of 4-byte data using the 6th characteristic in the 3rd service, use the following command:
AT+BLEGATTSNTFY=0,3,6,4
// After the symbol ">" shows, enter the 4-byte data, such as "1234". Then the data will be transmitted automatically.

[ESP32 Only] AT+BLEGATTSIND: Indicate the Characteristic Value from the Server to a Client

Set Command

Function:

Indicate the characteristic value from the server to a client.

Command:

AT+BLEGATTSIND=<conn_index>,<srv_index>,<char_index>,<length>

Response:

>

The symbol > indicates that AT is ready for receiving serial data and you can enter data now. When the requirement of data length determined by the parameter <length> is met, the indication starts.

If the data transmission is successful, AT returns:

OK

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <srv_index>: service’s index. It can be fetched with command AT+BLEGATTSCHAR?.
  • <char_index>: characteristic’s index; it can be fetched with command AT+BLEGATTSCHAR?.
  • <length>: data length.

Example

AT+BLEINIT=2      // Role: server
AT+BLEGATTSSRVCRE
AT+BLEGATTSSRVSTART
AT+BLEADVSTART    // Start advertising. After the client is connected, it must be configured to receive indications.
AT+BLEGATTSCHAR?  // Query the characteristics which the client can receive indications.
// For example, to indicate 4 bytes of data using the 7th characteristic in the 3rd service, use the following command:
AT+BLEGATTSIND=0,3,7,4
// After the symbol ">" shows, input 4 bytes of data, such as "1234". Then the data will be transmitted automatically.

[ESP32 Only] AT+BLEGATTSSETATTR: GATTS Sets Characteristics

Set Command

Function:

GATTS sets its characteristic (descriptor).

Command:

AT+BLEGATTSSETATTR=<srv_index>,<char_index>,[<desc_index>],<length>

Response:

>

The symbol > indicates that AT is ready for receiving serial data and you can enter data now. When the requirement of data length determined by the parameter <length> is met, the setting starts.

If the setting is successful, AT returns:

OK

Parameters

  • <srv_index>: service’s index. It can be fetched with command AT+BLEGATTSCHAR?.
  • <char_index>: characteristic’s index; it can be fetched with command AT+BLEGATTSCHAR?.
  • [<desc_index>]: descriptor’s index.
    • If it is set, this command is used to set the value of the descriptor.
    • Otherwise, this command is used to set the value of the characteristic.
  • <length>: data length.

Note

  • If the value of <length> is larger than the maximum length allowed, the setting will fail. The service table is defined in components/customized_partitions/raw_data/ble_data.

Example

AT+BLEINIT=2   // Role: server.
AT+BLEGATTSSRVCRE
AT+BLEGATTSSRVSTART
AT+BLEGATTSCHAR?
// For example, to set 1 byte of data of the 1st characteristic in the 1st service, use the following command:
AT+BLEGATTSSETATTR=1,1,,1
// After the symbol ">" shows, input 1 byte of data, such as "8". Then the setting starts.

[ESP32 Only] AT+BLEGATTCPRIMSRV: GATTC Discovers Primary Services

Query Command

Function:

Generic Attributes Client (GATTC) discovers primary services.

Command:

AT+BLEGATTCPRIMSRV=<conn_index>

Response:

+BLEGATTCPRIMSRV:<conn_index>,<srv_index>,<srv_uuid>,<srv_type>
OK

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <srv_index>: service’s index starting from 1.
  • <srv_uuid>: service’s UUID.
  • <srv_type>: service’s type.
    • 0: not primary service.
    • 1: primary service.

Note

  • The Bluetooth LE connection has to be established first.

Example

AT+BLEINIT=1   // role: client
AT+BLECONN=0,"24:12:5f:9d:91:98"
AT+BLEGATTCPRIMSRV=0

[ESP32 Only] AT+BLEGATTCINCLSRV: GATTC Discovers Included Services

Set Command

Function:

GATTC discovers included services.

Command:

AT+BLEGATTCINCLSRV=<conn_index>,<srv_index>

Response:

+BLEGATTCINCLSRV:<conn_index>,<srv_index>,<srv_uuid>,<srv_type>,<included_srv_uuid>,<included_srv_type>
OK

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <srv_index>: service’s index. It can be fetched with command AT+BLEGATTCPRIMSRV=<conn_index>.
  • <srv_uuid>: service’s UUID.
  • <srv_type>: service’s type.
    • 0: not primary service.
    • 1: primary service.
  • <included_srv_uuid>: included service’s UUID.
  • <included_srv_type>: included service’s type.
    • 0: not primary service.
    • 1: primary service.

Note

  • The Bluetooth LE connection has to be established first.

Example

AT+BLEINIT=1   // role: client
AT+BLECONN=0,"24:12:5f:9d:91:98"
AT+BLEGATTCPRIMSRV=0
AT+BLEGATTCINCLSRV=0,1  // set a specific index according to the result of the previous command

[ESP32 Only] AT+BLEGATTCCHAR: GATTC Discovers Characteristics

Set Command

Function:

GATTC discovers characteristics.

Command:

AT+BLEGATTCCHAR=<conn_index>,<srv_index>

Response:

The response for a characteristic:

+BLEGATTCCHAR:"char",<conn_index>,<srv_index>,<char_index>,<char_uuid>,<char_prop>

The response for a descriptor:

+BLEGATTCCHAR:"desc",<conn_index>,<srv_index>,<char_index>,<desc_index>,<desc_uuid>
OK

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <srv_index>: service’s index. It can be fetched with command AT+BLEGATTCPRIMSRV=<conn_index>.
  • <char_index>: characteristic’s index starting from 1.
  • <char_uuid>: characteristic’s UUID.
  • <char_prop>: characteristic’s properties.
  • <desc_index>: descriptor’s index.
  • <desc_uuid>: descriptor’s UUID.

Note

  • The Bluetooth LE connection has to be established first.

Example

AT+BLEINIT=1   // role: client
AT+BLECONN=0,"24:12:5f:9d:91:98"
AT+BLEGATTCPRIMSRV=0
AT+BLEGATTCCHAR=0,1 // set a specific index according to the result of the previous command

[ESP32 Only] AT+BLEGATTCRD: GATTC Reads Characteristics

Set Command

Function:

GATTC reads a characteristic or descriptor.

Command:

AT+BLEGATTCRD=<conn_index>,<srv_index>,<char_index>[,<desc_index>]

Response:

+BLEGATTCRD:<conn_index>,<len>,<value>
OK

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <srv_index>: service’s index. It can be fetched with command AT+BLEGATTCPRIMSRV=<conn_index>.
  • <char_index>: characteristic’s index; it can be fetched with command AT+BLEGATTCCHAR=<conn_index>,<srv_index>.
  • [<desc_index>]: descriptor’s index.
    • If it is set, the value of the target descriptor will be read.
    • if it is not set, the value of the target characteristic will be read.
  • <len>: data length.
  • <char_value>: characteristic’s value. HEX string is read by command AT+BLEGATTCRD=<conn_index>,<srv_index>,<char_index>. For example, if the response is +BLEGATTCRD:1,30, it means that the value length is 1, and the content is “0x30”.
  • [<desc_value>]: descriptor’s value. HEX string is read by command AT+BLEGATTCRD=<conn_index>,<srv_index>,<char_index>,<desc_index>. For example, if the response is +BLEGATTCRD:4,30313233, it means that the value length is 4, and the content is “0x30 0x31 0x32 0x33”.

Notes

  • The Bluetooth LE connection has to be established first.
  • If the target characteristic cannot be read, it will return “ERROR”.

Example

AT+BLEINIT=1   // Role: client.
AT+BLECONN=0,"24:12:5f:9d:91:98"
AT+BLEGATTCPRIMSRV=0
AT+BLEGATTCCHAR=0,3 // Set a specific index according to the result of the previous command.
// For example, to read 1st descriptor of the 2nd characteristic in the 3rd service, use the following command:
AT+BLEGATTCRD=0,3,2,1

[ESP32 Only] AT+BLEGATTCWR: GATTC Writes Characteristics

Set Command

Function:

GATTC writes characteristics or descriptors.

Command:

AT+BLEGATTCWR=<conn_index>,<srv_index>,<char_index>[,<desc_index>],<length>

Response:

>

The symbol > indicates that AT is ready for receiving serial data and you can enter data now. When the requirement of data length determined by the parameter <length> is met, the writing starts.

If the setting is successful, AT returns:

OK

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <srv_index>: service’s index. It can be fetched with command AT+BLEGATTCPRIMSRV=<conn_index>.
  • <char_index>: characteristic’s index; it can be fetched with command AT+BLEGATTCCHAR=<conn_index>,<srv_index>.
  • [<desc_index>]: descriptor’s index.
    • If it is set, the value of the target descriptor will be written.
    • If it is not set, the value of the target characteristic will be written.
  • <length>: data length.

Notes

  • The Bluetooth LE connection has to be established first.
  • If the target characteristic cannot be written, it will return “ERROR”.

Example

AT+BLEINIT=1   // Role: client.
AT+BLECONN=0,"24:12:5f:9d:91:98"
AT+BLEGATTCPRIMSRV=0
AT+BLEGATTCCHAR=0,3 // Set a specific index according to the result of the previous command.
// For example, to write 6 bytes of data to the 4th characteristic in the 3rd service, use the following command:
AT+BLEGATTCWR=0,3,4,,6
// After the symbol ">" shows, input 6 bytes of data, such as "123456". Then the writing starts.

[ESP32 Only] AT+BLESPPCFG: Query/Set Bluetooth LE SPP Parameters

Query Command

Function:

Query the parameters of Bluetooth LE Serial Port Profile (SPP).

Command:

AT+BLESPPCFG?

Response:

+BLESPPCFG:<tx_service_index>,<tx_char_index>,<rx_service_index>,<rx_char_index>
OK

Set Command

Function:

Set or reset the parameters of Bluetooth LE SPP.

Command:

AT+BLESPPCFG=<cfg_enable>[,<tx_service_index>,<tx_char_index>,<rx_service_index>,<rx_char_index>]

Response:

OK

Parameters

  • <cfg_enable>:
    • 0: all the SPP parameters will be reset, and the following four parameters don’t need input.
    • 1: you should input the following four parameters.
  • <tx_service_index>: tx service’s index. It can be fetched with command AT+BLEGATTCPRIMSRV=<conn_index> and AT+BLEGATTSSRV?.
  • <tx_char_index>: tx characteristic’s index. It can be fetched with command AT+BLEGATTCCHAR=<conn_index>,<srv_index> and AT+BLEGATTSCHAR?.
  • <rx_service_index>: rx service’s index. It can be fetched with command AT+BLEGATTCPRIMSRV=<conn_index> and AT+BLEGATTSSRV?.
  • <rx_char_index>: rx characteristic’s index. It can be fetched with command AT+BLEGATTCCHAR=<conn_index>,<srv_index> and AT+BLEGATTSCHAR?.

Notes

  • In Bluetooth LE client, the property of tx characteristic must be write with response or write without response, and the property of rx characteristic must be indicate or notify.
  • In Bluetooth LE server, the property of tx characteristic must be indicate or notify, and the property of rx characteristic must be write with response or write without response.

Example

AT+BLESPPCFG=0          // reset Bluetooth LE SPP parameters
AT+BLESPPCFG=1,3,5,3,7  // set Bluetooth LE SPP parameters
AT+BLESPPCFG?           // query Bluetooth LE SPP parameters

[ESP32 Only] AT+BLESPP: Enter Bluetooth LE SPP Mode

Execute Command

Function:

Enter Bluetooth LE SPP mode.

Command:

AT+BLESPP

Response:

OK

>

This response indicates that AT has entered Bluetooth LE SPP mode and can send and receive data.

If the Bluetooth LE SPP status is wrong ( Notifications are not enabled at the opposite end after the Bluetooth LE connection is established ), the system returns:

ERROR

Notes

  • During the SPP transmission, AT will not prompt any exit the Bluetooth LE SPP passthrough mode information unless Bit0 of AT+SYSMSG is 1.
  • During the SPP transmission, AT will not prompt any connection status changes unless Bit2 of AT+SYSMSG is 1.
  • When the packet which only contains +++ is received, the device returns to normal command mode. Please wait for at least one second before sending the next AT command.

Example

AT+BLESPP   // enter Bluetooth LE SPP mode

[ESP32 Only] AT+BLESECPARAM: Query/Set Bluetooth LE Encryption Parameters

Query Command

Function:

Query the parameters of Bluetooth LE SMP.

Command:

AT+BLESECPARAM?

Response:

+BLESECPARAM:<auth_req>,<iocap>,<key_size>,<init_key>,<rsp_key>,<auth_option>
OK

Set Command

Function:

Set the parameters of Bluetooth LE SMP.

Command:

AT+BLESECPARAM=<auth_req>,<iocap>,<key_size>,<init_key>,<rsp_key>[,<auth_option>]

Response:

OK

Parameters

  • <auth_req>: authentication request.
    • 0: NO_BOND
    • 1: BOND
    • 4: MITM
    • 8: SC_ONLY
    • 9: SC_BOND
    • 12: SC_MITM
    • 13: SC_MITM_BOND
  • <iocap>: input and output capability.
    • 0: DisplayOnly
    • 1: DisplayYesNo
    • 2: KeyboardOnly
    • 3: NoInputNoOutput
    • 4: Keyboard display
  • <key_size>: key length. Range: 7 ~ 16 bytes.
  • <init_key>: initial key represented in bit combinations.
  • <rsp_key>: response key represented in bit combinations.
  • <auth_option>: authentication option of security.
    • 0: Select the security level automatically.
    • 1: If it cannot follow the preset security level, the connection will disconnect.

Note

  • The bit pattern for parameters <init_key> and <rsp_key> is:
    • Bit0: Used to exchange the encryption key in the init key & response key.
    • Bit1: Used to exchange the IRK key in the init key & response key.
    • Bit2: Used to exchange the CSRK key in the init key & response key.
    • Bit3: Used to exchange the link key (only used in the Bluetooth LE & BR/EDR coexist mode) in the init key & response key.

Example

AT+BLESECPARAM=1,4,16,3,3,0

[ESP32 Only] AT+BLEENC: Initiate Bluetooth LE Encryption Request

Set Command

Function:

Start a pairing request

Command:

AT+BLEENC=<conn_index>,<sec_act>

Response:

OK

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <sec_act>:
    • 0: SEC_NONE
    • 1: SEC_ENCRYPT
    • 2: SEC_ENCRYPT_NO_MITM
    • 3: SEC_ENCRYPT_MITM

Note

  • Before running this command, please set the security parameters and connection with remote devices.

Example

AT+BLESECPARAM=1,4,16,3,3
AT+BLEENC=0,3

[ESP32 Only] AT+BLEENCRSP: Respond to the Pairing Request from the Peer Device

Set Command

Function:

Respond to the pairing request from the peer device.

Command:

AT+BLEENCRSP=<conn_index>,<accept>

Response:

OK

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <accept>:
    • 0: reject
    • 1: accept

Note

  • After running this command, AT will output the pairing result at the end of the pairing process.
+BLEAUTHCMPL:<conn_index>,<enc_result>
  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <enc_result>:
    • 0: encryption succeeded
    • 1: encryption failed

Example

AT+BLEENCRSP=0,1

[ESP32 Only] AT+BLEKEYREPLY: Reply the Key Value to the Peer Device in the Legacy Connection Stage

Set Command

Function:

Reply a pairing key.

Command:

AT+BLEKEYREPLY=<conn_index>,<key>

Response:

OK

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <key>: pairing key.

Example

AT+BLEKEYREPLY=0,649784

[ESP32 Only] AT+BLECONFREPLY: Reply the Confirm Value to the Peer Device in the Legacy Connection Stage

Set Command

Function:

Reply a pairing result.

Command:

AT+BLECONFREPLY=<conn_index>,<confirm>

Response:

OK

Parameters

  • <conn_index>: index of Bluetooth LE connection. Range: [0,2].
  • <confirm>:
    • 0: No
    • 1: Yes

Example

AT+BLECONFREPLY=0,1

[ESP32 Only] AT+BLEENCDEV: Query Bonded Bluetooth LE Encryption Device List

Query Command

Function:

Query bonded Bluetooth LE encryption device list.

Command:

AT+BLEENCDEV?

Response:

+BLEENCDEV:<enc_dev_index>,<mac_address>
OK

Parameters

  • <enc_dev_index>: index of the bonded devices.
  • <mac_address>: MAC address.

Example

AT+BLEENCDEV?

[ESP32 Only] AT+BLEENCCLEAR: Clear Bluetooth LE Encryption Device List

Set Command

Function:

Remove a device from the security database list with a specific index.

Command:

AT+BLEENCCLEAR=<enc_dev_index>

Response:

OK

Execute Command

Function:

Remove all devices from the security database.

Command:

AT+BLEENCCLEAR

Response:

OK

Parameter

  • <enc_dev_index>: index of the bonded devices.

Example

AT+BLEENCCLEAR

[ESP32 Only] AT+BLESETKEY: Set Bluetooth LE Static Pair Key

Query Command

Function:

Query the Bluetooth LE static pair key. If it is not set, AT will return -1.

Command:

AT+BLESETKEY?

Response:

+BLESETKEY:<static_key>
OK

Set Command

Function:

Set a Bluetooth LE static pair key for all Bluetooth LE connections.

Command:

AT+BLESETKEY=<static_key>

Response:

OK

Parameter

  • <static_key>: static Bluetooth LE pair key.

Example

AT+BLESETKEY=123456

[ESP32 Only] AT+BLEHIDINIT: Bluetooth LE HID Profile Initialization

Query Command

Function:

Query the initialization status of Bluetooth LE HID profile.

Command:

AT+BLEHIDINIT?

Response:

If Bluetooth LE HID device profile is not initialized, AT will return:

+BLEHIDINIT:0
OK

If Bluetooth LE HID device profile is initialized, AT will return:

+BLEHIDINIT:1
OK

Set Command

Function:

Initialize the Bluetooth LE HID profile.

Command:

AT+BLEHIDINIT=<init>

Response:

OK

Parameter

  • <init>:
    • 0: deinit Bluetooth LE HID profile
    • 1: init Bluetooth LE HID profile

Note

  • The Bluetooth LE HID command cannot be used at the same time with general GATT/GAP commands.

Example

AT+BLEHIDINIT=1

[ESP32 Only] AT+BLEHIDKB: Send Bluetooth LE HID Keyboard Information

Set Command

Function:

Send keyboard information.

Command:

AT+BLEHIDKB=<Modifier_keys>,<key_1>,<key_2>,<key_3>,<key_4>,<key_5>,<key_6>

Response:

OK

Parameters

  • <Modifier_keys>: modifier keys mask
  • <key_1>: key code 1
  • <key_2>: key code 2
  • <key_3>: key code 3
  • <key_4>: key code 4
  • <key_5>: key code 5
  • <key_6>: key code 6

Note

Example

AT+BLEHIDKB=0,4,0,0,0,0,0   // input the string "a"

[ESP32 Only] AT+BLEHIDMUS: Send Bluetooth LE HID Mouse Information

Set Command

Function:

Send mouse information.

Command:

AT+BLEHIDMUS=<buttons>,<X_displacement>,<Y_displacement>,<wheel>

Response:

OK

Parameters

  • <buttons>: mouse button
  • <X_displacement>: X displacement
  • <Y_displacement>: Y displacement
  • <wheel>: wheel

Example

AT+BLEHIDMUS=0,10,10,0

[ESP32 Only] AT+BLEHIDCONSUMER: Send Bluetooth LE HID Consumer Information

Set Command

Function:

Send consumer information.

Command:

AT+BLEHIDCONSUMER=<consumer_usage_id>

Response:

OK

Parameter

Example

AT+BLEHIDCONSUMER=233   // volume up

[ESP32 Only] AT+BLUFI: Start or Stop BluFi

Query Command

Function:

Query the status of BluFi.

Command:

AT+BLUFI?

Response:

If BluFi is not started, it will return:

+BLUFI:0
OK

If BluFi is started, it will return:

+BLUFI:1
OK

Set Command

Function:

Start or stop BluFi.

Command:

AT+BLUFI=<option>[,<auth floor>]

Response:

OK

Parameter

  • <option>:
    • 0: stop BluFi
    • 1: start BluFi
  • <auth floor>: Wi-Fi authentication mode floor. ESP-AT will not connect to the AP whose authmode is lower than this floor.
    • 0: OPEN (Default)
    • 1: WEP
    • 2: WPA_PSK
    • 3: WPA2_PSK
    • 4: WPA_WPA2_PSK
    • 5: WPA2_ENTERPRISE
    • 6: WPA3_PSK
    • 7: WPA2_WPA3_PSK

Example

AT+BLUFI=1

[ESP32 Only] AT+BLUFINAME: Query/Set BluFi Device Name

Query Command

Function:

Query the BluFi name.

Command:

AT+BLUFINAME?

Response:

+BLUFINAME:<device_name>
OK

Set Command

Function:

Set the BluFi device name.

Command:

AT+BLUFINAME=<device_name>

Response:

OK

Parameter

  • <device_name>: the name of BluFi device.

Notes

  • If you need to set BluFi name, please set it before command AT+BLUFI=1. Otherwise, it will use the default name BLUFI_DEVICE.
  • The maximum length of BluFi name is 29 bytes.

Example

AT+BLUFINAME="BLUFI_DEV"
AT+BLUFINAME?