Protocol Communication
Overview
Protocol Communication (protocomm) component manages secure sessions and provides framework for multiple transports. The application can also use protocomm layer directly to have application specific extensions for the provisioning (or non-provisioning) use cases.
- Following features are available for provisioning :
- Communication security at application level -
protocomm_security0 (no security)
protocomm_security1 (Curve25519 key exchange + AES-CTR encryption/decryption)
protocomm_security2 (SRP6a-based key exchange + AES-GCM encryption/decryption)
Proof-of-possession (support with protocomm_security1 only)
Salt and Verifier (support with protocomm_security2 only)
Protocomm internally uses protobuf (protocol buffers) for secure session establishment. Though users can implement their own security (even without using protobuf). One can even use protocomm without any security layer.
Protocomm provides framework for various transports - WiFi (SoftAP+HTTPD), BLE, console - in which case the handler invocation is automatically taken care of on the device side (see Transport Examples below for code snippets).
Note that the client still needs to establish session (for protocomm_security1 and protocomm_security2) by performing the two way handshake. See Unified Provisioning for more details about the secure handshake logic.
Enabling protocomm security version
Protocomm component provides project configuration menu to enable/disable support of respective security versions. The respective configuration options can be found as follows:
Support protocomm security version 0 (no security): CONFIG_ESP_PROTOCOMM_SUPPORT_SECURITY_VERSION_0 (this option is enabled by default)
Support protocomm security version 1 (Curve25519 key exchange + AES-CTR encryption/decryption): CONFIG_ESP_PROTOCOMM_SUPPORT_SECURITY_VERSION_1 (this option is enabled by default)
Support protocomm security version 2 (SRP6a-based key exchange + AES-GCM encryption/decryption): CONFIG_ESP_PROTOCOMM_SUPPORT_SECURITY_VERSION_2
备注
Enabling multiple security versions allow to control them dynamically but also increases firmware size.
Transport Example (SoftAP + HTTP) with Security 2
For sample usage, see wifi_provisioning/src/scheme_softap.c
/* Endpoint handler to be registered with protocomm. * This simply echoes back the received data. */ esp_err_t echo_req_handler (uint32_t session_id, const uint8_t *inbuf, ssize_t inlen, uint8_t **outbuf, ssize_t *outlen, void *priv_data) { /* Session ID may be used for persistence */ printf("Session ID : %d", session_id); /* Echo back the received data */ *outlen = inlen; /* Output data length updated */ *outbuf = malloc(inlen); /* This will be deallocated outside */ memcpy(*outbuf, inbuf, inlen); /* Private data that was passed at the time of endpoint creation */ uint32_t *priv = (uint32_t *) priv_data; if (priv) { printf("Private data : %d", *priv); } return ESP_OK; } static const char sec2_salt[] = {0xf7, 0x5f, 0xe2, 0xbe, 0xba, 0x7c, 0x81, 0xcd}; static const char sec2_verifier[] = {0xbf, 0x86, 0xce, 0x63, 0x8a, 0xbb, 0x7e, 0x2f, 0x38, 0xa8, 0x19, 0x1b, 0x35, 0xc9, 0xe3, 0xbe, 0xc3, 0x2b, 0x45, 0xee, 0x10, 0x74, 0x22, 0x1a, 0x95, 0xbe, 0x62, 0xf7, 0x0c, 0x65, 0x83, 0x50, 0x08, 0xef, 0xaf, 0xa5, 0x94, 0x4b, 0xcb, 0xe1, 0xce, 0x59, 0x2a, 0xe8, 0x7b, 0x27, 0xc8, 0x72, 0x26, 0x71, 0xde, 0xb2, 0xf2, 0x80, 0x02, 0xdd, 0x11, 0xf0, 0x38, 0x0e, 0x95, 0x25, 0x00, 0xcf, 0xb3, 0x3f, 0xf0, 0x73, 0x2a, 0x25, 0x03, 0xe8, 0x51, 0x72, 0xef, 0x6d, 0x3e, 0x14, 0xb9, 0x2e, 0x9f, 0x2a, 0x90, 0x9e, 0x26, 0xb6, 0x3e, 0xc7, 0xe4, 0x9f, 0xe3, 0x20, 0xce, 0x28, 0x7c, 0xbf, 0x89, 0x50, 0xc9, 0xb6, 0xec, 0xdd, 0x81, 0x18, 0xf1, 0x1a, 0xd9, 0x7a, 0x21, 0x99, 0xf1, 0xee, 0x71, 0x2f, 0xcc, 0x93, 0x16, 0x34, 0x0c, 0x79, 0x46, 0x23, 0xe4, 0x32, 0xec, 0x2d, 0x9e, 0x18, 0xa6, 0xb9, 0xbb, 0x0a, 0xcf, 0xc4, 0xa8, 0x32, 0xc0, 0x1c, 0x32, 0xa3, 0x97, 0x66, 0xf8, 0x30, 0xb2, 0xda, 0xf9, 0x8d, 0xc3, 0x72, 0x72, 0x5f, 0xe5, 0xee, 0xc3, 0x5c, 0x24, 0xc8, 0xdd, 0x54, 0x49, 0xfc, 0x12, 0x91, 0x81, 0x9c, 0xc3, 0xac, 0x64, 0x5e, 0xd6, 0x41, 0x88, 0x2f, 0x23, 0x66, 0xc8, 0xac, 0xb0, 0x35, 0x0b, 0xf6, 0x9c, 0x88, 0x6f, 0xac, 0xe1, 0xf4, 0xca, 0xc9, 0x07, 0x04, 0x11, 0xda, 0x90, 0x42, 0xa9, 0xf1, 0x97, 0x3d, 0x94, 0x65, 0xe4, 0xfb, 0x52, 0x22, 0x3b, 0x7a, 0x7b, 0x9e, 0xe9, 0xee, 0x1c, 0x44, 0xd0, 0x73, 0x72, 0x2a, 0xca, 0x85, 0x19, 0x4a, 0x60, 0xce, 0x0a, 0xc8, 0x7d, 0x57, 0xa4, 0xf8, 0x77, 0x22, 0xc1, 0xa5, 0xfa, 0xfb, 0x7b, 0x91, 0x3b, 0xfe, 0x87, 0x5f, 0xfe, 0x05, 0xd2, 0xd6, 0xd3, 0x74, 0xe5, 0x2e, 0x68, 0x79, 0x34, 0x70, 0x40, 0x12, 0xa8, 0xe1, 0xb4, 0x6c, 0xaa, 0x46, 0x73, 0xcd, 0x8d, 0x17, 0x72, 0x67, 0x32, 0x42, 0xdc, 0x10, 0xd3, 0x71, 0x7e, 0x8b, 0x00, 0x46, 0x9b, 0x0a, 0xe9, 0xb4, 0x0f, 0xeb, 0x70, 0x52, 0xdd, 0x0a, 0x1c, 0x7e, 0x2e, 0xb0, 0x61, 0xa6, 0xe1, 0xa3, 0x34, 0x4b, 0x2a, 0x3c, 0xc4, 0x5d, 0x42, 0x05, 0x58, 0x25, 0xd3, 0xca, 0x96, 0x5c, 0xb9, 0x52, 0xf9, 0xe9, 0x80, 0x75, 0x3d, 0xc8, 0x9f, 0xc7, 0xb2, 0xaa, 0x95, 0x2e, 0x76, 0xb3, 0xe1, 0x48, 0xc1, 0x0a, 0xa1, 0x0a, 0xe8, 0xaf, 0x41, 0x28, 0xd2, 0x16, 0xe1, 0xa6, 0xd0, 0x73, 0x51, 0x73, 0x79, 0x98, 0xd9, 0xb9, 0x00, 0x50, 0xa2, 0x4d, 0x99, 0x18, 0x90, 0x70, 0x27, 0xe7, 0x8d, 0x56, 0x45, 0x34, 0x1f, 0xb9, 0x30, 0xda, 0xec, 0x4a, 0x08, 0x27, 0x9f, 0xfa, 0x59, 0x2e, 0x36, 0x77, 0x00, 0xe2, 0xb6, 0xeb, 0xd1, 0x56, 0x50, 0x8e}; /* Example function for launching a protocomm instance over HTTP */ protocomm_t *start_pc() { protocomm_t *pc = protocomm_new(); /* Config for protocomm_httpd_start() */ protocomm_httpd_config_t pc_config = { .data = { .config = PROTOCOMM_HTTPD_DEFAULT_CONFIG() } }; /* Start protocomm server on top of HTTP */ protocomm_httpd_start(pc, &pc_config); /* Create Security2 params object from salt and verifier. It must be valid * throughout the scope of protocomm endpoint. This need not be static, * ie. could be dynamically allocated and freed at the time of endpoint * removal */ const static protocomm_security2_params_t sec2_params = { .salt = (const uint8_t *) salt, .salt_len = sizeof(salt), .verifier = (const uint8_t *) verifier, .verifier_len = sizeof(verifier), }; /* Set security for communication at application level. Just like for * request handlers, setting security creates an endpoint and registers * the handler provided by protocomm_security1. One can similarly use * protocomm_security0. Only one type of security can be set for a * protocomm instance at a time. */ protocomm_set_security(pc, "security_endpoint", &protocomm_security2, &sec2_params); /* Private data passed to the endpoint must be valid throughout the scope * of protocomm endpoint. This need not be static, ie. could be dynamically * allocated and freed at the time of endpoint removal */ static uint32_t priv_data = 1234; /* Add a new endpoint for the protocomm instance, identified by a unique name * and register a handler function along with private data to be passed at the * time of handler execution. Multiple endpoints can be added as long as they * are identified by unique names */ protocomm_add_endpoint(pc, "echo_req_endpoint", echo_req_handler, (void *) &priv_data); return pc; } /* Example function for stopping a protocomm instance */ void stop_pc(protocomm_t *pc) { /* Remove endpoint identified by it's unique name */ protocomm_remove_endpoint(pc, "echo_req_endpoint"); /* Remove security endpoint identified by it's name */ protocomm_unset_security(pc, "security_endpoint"); /* Stop HTTP server */ protocomm_httpd_stop(pc); /* Delete (deallocate) the protocomm instance */ protocomm_delete(pc); }
Transport Example (SoftAP + HTTP) with Security 1
For sample usage, see wifi_provisioning/src/scheme_softap.c
/* Endpoint handler to be registered with protocomm. * This simply echoes back the received data. */ esp_err_t echo_req_handler (uint32_t session_id, const uint8_t *inbuf, ssize_t inlen, uint8_t **outbuf, ssize_t *outlen, void *priv_data) { /* Session ID may be used for persistence */ printf("Session ID : %d", session_id); /* Echo back the received data */ *outlen = inlen; /* Output data length updated */ *outbuf = malloc(inlen); /* This will be deallocated outside */ memcpy(*outbuf, inbuf, inlen); /* Private data that was passed at the time of endpoint creation */ uint32_t *priv = (uint32_t *) priv_data; if (priv) { printf("Private data : %d", *priv); } return ESP_OK; } /* Example function for launching a protocomm instance over HTTP */ protocomm_t *start_pc(const char *pop_string) { protocomm_t *pc = protocomm_new(); /* Config for protocomm_httpd_start() */ protocomm_httpd_config_t pc_config = { .data = { .config = PROTOCOMM_HTTPD_DEFAULT_CONFIG() } }; /* Start protocomm server on top of HTTP */ protocomm_httpd_start(pc, &pc_config); /* Create security1 params object from pop_string. It must be valid * throughout the scope of protocomm endpoint. This need not be static, * ie. could be dynamically allocated and freed at the time of endpoint * removal */ const static protocomm_security1_params_t sec1_params = { .data = (const uint8_t *) strdup(pop_string), .len = strlen(pop_string) }; /* Set security for communication at application level. Just like for * request handlers, setting security creates an endpoint and registers * the handler provided by protocomm_security1. One can similarly use * protocomm_security0. Only one type of security can be set for a * protocomm instance at a time. */ protocomm_set_security(pc, "security_endpoint", &protocomm_security1, &sec1_params); /* Private data passed to the endpoint must be valid throughout the scope * of protocomm endpoint. This need not be static, ie. could be dynamically * allocated and freed at the time of endpoint removal */ static uint32_t priv_data = 1234; /* Add a new endpoint for the protocomm instance, identified by a unique name * and register a handler function along with private data to be passed at the * time of handler execution. Multiple endpoints can be added as long as they * are identified by unique names */ protocomm_add_endpoint(pc, "echo_req_endpoint", echo_req_handler, (void *) &priv_data); return pc; } /* Example function for stopping a protocomm instance */ void stop_pc(protocomm_t *pc) { /* Remove endpoint identified by it's unique name */ protocomm_remove_endpoint(pc, "echo_req_endpoint"); /* Remove security endpoint identified by it's name */ protocomm_unset_security(pc, "security_endpoint"); /* Stop HTTP server */ protocomm_httpd_stop(pc); /* Delete (deallocate) the protocomm instance */ protocomm_delete(pc); }
Transport Example (BLE) with Security 0
For sample usage, see wifi_provisioning/src/scheme_ble.c
/* Example function for launching a secure protocomm instance over BLE */ protocomm_t *start_pc() { protocomm_t *pc = protocomm_new(); /* Endpoint UUIDs */ protocomm_ble_name_uuid_t nu_lookup_table[] = { {"security_endpoint", 0xFF51}, {"echo_req_endpoint", 0xFF52} }; /* Config for protocomm_ble_start() */ protocomm_ble_config_t config = { .service_uuid = { /* LSB <--------------------------------------- * ---------------------------------------> MSB */ 0xfb, 0x34, 0x9b, 0x5f, 0x80, 0x00, 0x00, 0x80, 0x00, 0x10, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, }, .nu_lookup_count = sizeof(nu_lookup_table)/sizeof(nu_lookup_table[0]), .nu_lookup = nu_lookup_table }; /* Start protocomm layer on top of BLE */ protocomm_ble_start(pc, &config); /* For protocomm_security0, Proof of Possession is not used, and can be kept NULL */ protocomm_set_security(pc, "security_endpoint", &protocomm_security0, NULL); protocomm_add_endpoint(pc, "echo_req_endpoint", echo_req_handler, NULL); return pc; } /* Example function for stopping a protocomm instance */ void stop_pc(protocomm_t *pc) { protocomm_remove_endpoint(pc, "echo_req_endpoint"); protocomm_unset_security(pc, "security_endpoint"); /* Stop BLE protocomm service */ protocomm_ble_stop(pc); protocomm_delete(pc); }
API Reference
Header File
Functions
-
protocomm_t *protocomm_new(void)
Create a new protocomm instance.
This API will return a new dynamically allocated protocomm instance with all elements of the protocomm_t structure initialized to NULL.
- 返回
protocomm_t* : On success
NULL : No memory for allocating new instance
-
void protocomm_delete(protocomm_t *pc)
Delete a protocomm instance.
This API will deallocate a protocomm instance that was created using
protocomm_new()
.- 参数
pc – [in] Pointer to the protocomm instance to be deleted
-
esp_err_t protocomm_add_endpoint(protocomm_t *pc, const char *ep_name, protocomm_req_handler_t h, void *priv_data)
Add endpoint request handler for a protocomm instance.
This API will bind an endpoint handler function to the specified endpoint name, along with any private data that needs to be pass to the handler at the time of call.
备注
An endpoint must be bound to a valid protocomm instance, created using
protocomm_new()
.This function internally calls the registered
add_endpoint()
function of the selected transport which is a member of the protocomm_t instance structure.
- 参数
pc – [in] Pointer to the protocomm instance
ep_name – [in] Endpoint identifier(name) string
h – [in] Endpoint handler function
priv_data – [in] Pointer to private data to be passed as a parameter to the handler function on call. Pass NULL if not needed.
- 返回
ESP_OK : Success
ESP_FAIL : Error adding endpoint / Endpoint with this name already exists
ESP_ERR_NO_MEM : Error allocating endpoint resource
ESP_ERR_INVALID_ARG : Null instance/name/handler arguments
-
esp_err_t protocomm_remove_endpoint(protocomm_t *pc, const char *ep_name)
Remove endpoint request handler for a protocomm instance.
This API will remove a registered endpoint handler identified by an endpoint name.
备注
This function internally calls the registered
remove_endpoint()
function which is a member of the protocomm_t instance structure.
- 参数
pc – [in] Pointer to the protocomm instance
ep_name – [in] Endpoint identifier(name) string
- 返回
ESP_OK : Success
ESP_ERR_NOT_FOUND : Endpoint with specified name doesn’t exist
ESP_ERR_INVALID_ARG : Null instance/name arguments
-
esp_err_t protocomm_open_session(protocomm_t *pc, uint32_t session_id)
Allocates internal resources for new transport session.
备注
An endpoint must be bound to a valid protocomm instance, created using
protocomm_new()
.
- 参数
pc – [in] Pointer to the protocomm instance
session_id – [in] Unique ID for a communication session
- 返回
ESP_OK : Request handled successfully
ESP_ERR_NO_MEM : Error allocating internal resource
ESP_ERR_INVALID_ARG : Null instance/name arguments
-
esp_err_t protocomm_close_session(protocomm_t *pc, uint32_t session_id)
Frees internal resources used by a transport session.
备注
An endpoint must be bound to a valid protocomm instance, created using
protocomm_new()
.
- 参数
pc – [in] Pointer to the protocomm instance
session_id – [in] Unique ID for a communication session
- 返回
ESP_OK : Request handled successfully
ESP_ERR_INVALID_ARG : Null instance/name arguments
-
esp_err_t protocomm_req_handle(protocomm_t *pc, const char *ep_name, uint32_t session_id, const uint8_t *inbuf, ssize_t inlen, uint8_t **outbuf, ssize_t *outlen)
Calls the registered handler of an endpoint session for processing incoming data and generating the response.
备注
An endpoint must be bound to a valid protocomm instance, created using
protocomm_new()
.Resulting output buffer must be deallocated by the caller.
- 参数
pc – [in] Pointer to the protocomm instance
ep_name – [in] Endpoint identifier(name) string
session_id – [in] Unique ID for a communication session
inbuf – [in] Input buffer contains input request data which is to be processed by the registered handler
inlen – [in] Length of the input buffer
outbuf – [out] Pointer to internally allocated output buffer, where the resulting response data output from the registered handler is to be stored
outlen – [out] Buffer length of the allocated output buffer
- 返回
ESP_OK : Request handled successfully
ESP_FAIL : Internal error in execution of registered handler
ESP_ERR_NO_MEM : Error allocating internal resource
ESP_ERR_NOT_FOUND : Endpoint with specified name doesn’t exist
ESP_ERR_INVALID_ARG : Null instance/name arguments
-
esp_err_t protocomm_set_security(protocomm_t *pc, const char *ep_name, const protocomm_security_t *sec, const void *sec_params)
Add endpoint security for a protocomm instance.
This API will bind a security session establisher to the specified endpoint name, along with any proof of possession that may be required for authenticating a session client.
备注
An endpoint must be bound to a valid protocomm instance, created using
protocomm_new()
.The choice of security can be any
protocomm_security_t
instance. Choicesprotocomm_security0
andprotocomm_security1
andprotocomm_security2
are readily available.
- 参数
pc – [in] Pointer to the protocomm instance
ep_name – [in] Endpoint identifier(name) string
sec – [in] Pointer to endpoint security instance
sec_params – [in] Pointer to security params (NULL if not needed) The pointer should contain the security params struct of appropriate security version. For protocomm security version 1 and 2 sec_params should contain pointer to struct of type protocomm_security1_params_t and protocmm_security2_params_t respectively.
- 返回
ESP_OK : Success
ESP_FAIL : Error adding endpoint / Endpoint with this name already exists
ESP_ERR_INVALID_STATE : Security endpoint already set
ESP_ERR_NO_MEM : Error allocating endpoint resource
ESP_ERR_INVALID_ARG : Null instance/name/handler arguments
-
esp_err_t protocomm_unset_security(protocomm_t *pc, const char *ep_name)
Remove endpoint security for a protocomm instance.
This API will remove a registered security endpoint identified by an endpoint name.
- 参数
pc – [in] Pointer to the protocomm instance
ep_name – [in] Endpoint identifier(name) string
- 返回
ESP_OK : Success
ESP_ERR_NOT_FOUND : Endpoint with specified name doesn’t exist
ESP_ERR_INVALID_ARG : Null instance/name arguments
-
esp_err_t protocomm_set_version(protocomm_t *pc, const char *ep_name, const char *version)
Set endpoint for version verification.
This API can be used for setting an application specific protocol version which can be verified by clients through the endpoint.
备注
An endpoint must be bound to a valid protocomm instance, created using
protocomm_new()
.
- 参数
pc – [in] Pointer to the protocomm instance
ep_name – [in] Endpoint identifier(name) string
version – [in] Version identifier(name) string
- 返回
ESP_OK : Success
ESP_FAIL : Error adding endpoint / Endpoint with this name already exists
ESP_ERR_INVALID_STATE : Version endpoint already set
ESP_ERR_NO_MEM : Error allocating endpoint resource
ESP_ERR_INVALID_ARG : Null instance/name/handler arguments
-
esp_err_t protocomm_unset_version(protocomm_t *pc, const char *ep_name)
Remove version verification endpoint from a protocomm instance.
This API will remove a registered version endpoint identified by an endpoint name.
- 参数
pc – [in] Pointer to the protocomm instance
ep_name – [in] Endpoint identifier(name) string
- 返回
ESP_OK : Success
ESP_ERR_NOT_FOUND : Endpoint with specified name doesn’t exist
ESP_ERR_INVALID_ARG : Null instance/name arguments
Type Definitions
-
typedef esp_err_t (*protocomm_req_handler_t)(uint32_t session_id, const uint8_t *inbuf, ssize_t inlen, uint8_t **outbuf, ssize_t *outlen, void *priv_data)
Function prototype for protocomm endpoint handler.
-
typedef struct protocomm protocomm_t
This structure corresponds to a unique instance of protocomm returned when the API
protocomm_new()
is called. The remaining Protocomm APIs require this object as the first parameter.备注
Structure of the protocomm object is kept private
Structures
-
struct protocomm_security1_params
Protocomm Security 1 parameters: Proof Of Possession.
-
struct protocomm_security2_params
Protocomm Security 2 parameters: Salt and Verifier.
-
struct protocomm_security
Protocomm security object structure.
The member functions are used for implementing secure protocomm sessions.
备注
This structure should not have any dynamic members to allow re-entrancy
Public Members
-
int ver
Unique version number of security implementation
-
esp_err_t (*init)(protocomm_security_handle_t *handle)
Function for initializing/allocating security infrastructure
-
esp_err_t (*cleanup)(protocomm_security_handle_t handle)
Function for deallocating security infrastructure
-
esp_err_t (*new_transport_session)(protocomm_security_handle_t handle, uint32_t session_id)
Starts new secure transport session with specified ID
-
esp_err_t (*close_transport_session)(protocomm_security_handle_t handle, uint32_t session_id)
Closes a secure transport session with specified ID
-
esp_err_t (*security_req_handler)(protocomm_security_handle_t handle, const void *sec_params, uint32_t session_id, const uint8_t *inbuf, ssize_t inlen, uint8_t **outbuf, ssize_t *outlen, void *priv_data)
Handler function for authenticating connection request and establishing secure session
-
esp_err_t (*encrypt)(protocomm_security_handle_t handle, uint32_t session_id, const uint8_t *inbuf, ssize_t inlen, uint8_t **outbuf, ssize_t *outlen)
Function which implements the encryption algorithm
-
esp_err_t (*decrypt)(protocomm_security_handle_t handle, uint32_t session_id, const uint8_t *inbuf, ssize_t inlen, uint8_t **outbuf, ssize_t *outlen)
Function which implements the decryption algorithm
-
int ver
Type Definitions
-
typedef struct protocomm_security1_params protocomm_security1_params_t
Protocomm Security 1 parameters: Proof Of Possession.
-
typedef protocomm_security1_params_t protocomm_security_pop_t
-
typedef struct protocomm_security2_params protocomm_security2_params_t
Protocomm Security 2 parameters: Salt and Verifier.
-
typedef void *protocomm_security_handle_t
-
typedef struct protocomm_security protocomm_security_t
Protocomm security object structure.
The member functions are used for implementing secure protocomm sessions.
备注
This structure should not have any dynamic members to allow re-entrancy
Functions
-
esp_err_t protocomm_httpd_start(protocomm_t *pc, const protocomm_httpd_config_t *config)
Start HTTPD protocomm transport.
This API internally creates a framework to allow endpoint registration and security configuration for the protocomm.
备注
This is a singleton. ie. Protocomm can have multiple instances, but only one instance can be bound to an HTTP transport layer.
- 参数
pc – [in] Protocomm instance pointer obtained from protocomm_new()
config – [in] Pointer to config structure for initializing HTTP server
- 返回
ESP_OK : Success
ESP_ERR_INVALID_ARG : Null arguments
ESP_ERR_NOT_SUPPORTED : Transport layer bound to another protocomm instance
ESP_ERR_INVALID_STATE : Transport layer already bound to this protocomm instance
ESP_ERR_NO_MEM : Memory allocation for server resource failed
ESP_ERR_HTTPD_* : HTTP server error on start
-
esp_err_t protocomm_httpd_stop(protocomm_t *pc)
Stop HTTPD protocomm transport.
This API cleans up the HTTPD transport protocomm and frees all the handlers registered with the protocomm.
- 参数
pc – [in] Same protocomm instance that was passed to protocomm_httpd_start()
- 返回
ESP_OK : Success
ESP_ERR_INVALID_ARG : Null / incorrect protocomm instance pointer
Unions
-
union protocomm_httpd_config_data_t
- #include <protocomm_httpd.h>
Protocomm HTTPD Configuration Data
Public Members
-
void *handle
HTTP Server Handle, if ext_handle_provided is set to true
-
protocomm_http_server_config_t config
HTTP Server Configuration, if a server is not already active
-
void *handle
Structures
-
struct protocomm_http_server_config_t
Config parameters for protocomm HTTP server.
-
struct protocomm_httpd_config_t
Config parameters for protocomm HTTP server.
Public Members
-
bool ext_handle_provided
Flag to indicate of an external HTTP Server Handle has been provided. In such as case, protocomm will use the same HTTP Server and not start a new one internally.
-
protocomm_httpd_config_data_t data
Protocomm HTTPD Configuration Data
-
bool ext_handle_provided
Functions
-
esp_err_t protocomm_ble_start(protocomm_t *pc, const protocomm_ble_config_t *config)
Start Bluetooth Low Energy based transport layer for provisioning.
Initialize and start required BLE service for provisioning. This includes the initialization for characteristics/service for BLE.
- 参数
pc – [in] Protocomm instance pointer obtained from protocomm_new()
config – [in] Pointer to config structure for initializing BLE
- 返回
ESP_OK : Success
ESP_FAIL : Simple BLE start error
ESP_ERR_NO_MEM : Error allocating memory for internal resources
ESP_ERR_INVALID_STATE : Error in ble config
ESP_ERR_INVALID_ARG : Null arguments
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esp_err_t protocomm_ble_stop(protocomm_t *pc)
Stop Bluetooth Low Energy based transport layer for provisioning.
Stops service/task responsible for BLE based interactions for provisioning
备注
You might want to optionally reclaim memory from Bluetooth. Refer to the documentation of
esp_bt_mem_release
in that case.- 参数
pc – [in] Same protocomm instance that was passed to protocomm_ble_start()
- 返回
ESP_OK : Success
ESP_FAIL : Simple BLE stop error
ESP_ERR_INVALID_ARG : Null / incorrect protocomm instance
Structures
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struct name_uuid
This structure maps handler required by protocomm layer to UUIDs which are used to uniquely identify BLE characteristics from a smartphone or a similar client device.
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struct protocomm_ble_config
Config parameters for protocomm BLE service.
Public Members
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char device_name[MAX_BLE_DEVNAME_LEN]
BLE device name being broadcast at the time of provisioning
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uint8_t service_uuid[BLE_UUID128_VAL_LENGTH]
128 bit UUID of the provisioning service
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uint8_t *manufacturer_data
BLE device manufacturer data pointer in advertisement
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ssize_t manufacturer_data_len
BLE device manufacturer data length in advertisement
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ssize_t nu_lookup_count
Number of entries in the Name-UUID lookup table
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protocomm_ble_name_uuid_t *nu_lookup
Pointer to the Name-UUID lookup table
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unsigned ble_bonding
BLE bonding
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unsigned ble_sm_sc
BLE security flag
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char device_name[MAX_BLE_DEVNAME_LEN]
Macros
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MAX_BLE_DEVNAME_LEN
BLE device name cannot be larger than this value 31 bytes (max scan response size) - 1 byte (length) - 1 byte (type) = 29 bytes
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BLE_UUID128_VAL_LENGTH
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MAX_BLE_MANUFACTURER_DATA_LEN
Theoretically, the limit for max manufacturer length remains same as BLE device name i.e. 31 bytes (max scan response size) - 1 byte (length) - 1 byte (type) = 29 bytes However, manufacturer data goes along with BLE device name in scan response. So, it is important to understand the actual length should be smaller than (29 - (BLE device name length) - 2).
Type Definitions
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typedef struct name_uuid protocomm_ble_name_uuid_t
This structure maps handler required by protocomm layer to UUIDs which are used to uniquely identify BLE characteristics from a smartphone or a similar client device.
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typedef struct protocomm_ble_config protocomm_ble_config_t
Config parameters for protocomm BLE service.