concurrent write to websocket connection

### ESP32 WebSocket AT Command Implementation For implementing WebSocket communication using ESP32 through AT commands, one approach involves configuring and utilizing specific AT commands designed for establishing a WebSocket connection. The helper function that creates an outbound WebSocket connection plays a crucial role in this context[^1]. Below is how these components come together: #### Establishing WebSocket Connection via AT Commands To establish a WebSocket connection on ESP32 using AT commands, several key steps need to be followed by sending appropriate AT instructions over UART interface. - **Initialization**: Ensure the module initializes properly. ```bash AT+UART_DEF=9600,8,1,0,0 ``` - **Setting WiFi Mode**: Switching between station mode (`STA`), soft access point mode (`SOFT_AP`) or both modes can be done with `AT+CWMODE`. ```bash AT+CWMODE=1 ``` - **Connecting to AP**: Connects ESP32 to specified Wi-Fi network. ```bash AT+CWJAP="SSID","PASSWORD" ``` - **Starting WebSocket Client**: Initiates WebSocket client session towards target server address. ```bash AT+CWSLCLIENT="ws://example.com/socket",port_number ``` This sequence allows setting up necessary parameters before initiating actual data exchange sessions over WebSockets protocol stack implemented within firmware of ESP32 modules. When integrating additional functionalities like handling concurrent operations efficiently during development phase without relying heavily upon external dependencies such as libuv, developers should ensure compatibility regarding threading models especially when incorporating third-party libraries into projects built around platforms similar to libwebsockets framework mentioned earlier[^2]. ```cpp // Example pseudo-code snippet demonstrating initialization routine void setup() { Serial.begin(115200); // Initialize WiFi & connect... } void loop() { if (WiFi.status() == WL_CONNECTED) { // Send AT command to start WebSocket client after successful WiFi association String wsCmd = "AT+CWSLCLIENT=\"wss://echo.websocket.org\",443"; Serial.println(wsCmd); delay(2000); // Wait for response while(Serial.available()) { char c = Serial.read(); Serial.write(c); } } else { // Handle reconnection logic here... } } ```