Module esp_now

Available on crate feature unstable only.

ESP-NOW is a kind of connectionless Wi-Fi communication protocol that is defined by Espressif.

In ESP-NOW, application data is encapsulated in a vendor-specific action frame and then transmitted from one Wi-Fi device to another without connection. CTR with CBC-MAC Protocol(CCMP) is used to protect the action frame for security. ESP-NOW is widely used in smart light, remote controlling, sensor, etc.

For more information see https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/network/esp_now.html

Structs

EspNow

ESP-NOW is a kind of connection-less Wi-Fi communication protocol that is defined by Espressif. In ESP-NOW, application data is encapsulated in a vendor-specific action frame and then transmitted from one Wi-Fi device to another without connection. CTR with CBC-MAC Protocol(CCMP) is used to protect the action frame for security. ESP-NOW is widely used in smart light, remote controlling, sensor, etc.

EspNowManager

Manages the EspNow instance lifecycle while ensuring it remains active.

EspNowReceiver

This is the receiver part of ESP-NOW. You can get this receiver by splitting an EspNow instance.

EspNowSender

This is the sender part of ESP-NOW. You can get this sender by splitting a EspNow instance.

PeerCount

Holds the count of peers in an ESP-NOW communication context.

PeerInfo

ESP-NOW peer information parameters.

ReceiveFuture

It’s not logically safe to poll multiple instances of ReceiveFuture simultaneously since the callback can only wake one future, leaving the rest of them unwakable.

ReceiveInfo

Information about a received packet.

ReceivedData

Stores information about the received data, including the packet content and associated information.

SendFuture

A future representing the result of an asynchronous ESP-NOW send operation.

SendWaiter

This struct is returned by a sync esp now send. Invoking wait method of this struct will block current task until the callback function of esp now send is called and return the status of previous sending.

Enums

Error

Internal errors that can occur with ESP-NOW.

EspNowError

Common errors that can occur while using ESP-NOW driver.

EspNowWifiInterface

The interface to use for this peer

WifiPhyRate

ESP-NOW rate of specified interface.

Constants

BROADCAST_ADDRESS

Broadcast address

ESP_NOW_MAX_DATA_LEN

Maximum payload length