WebSockets_Generic Library. Now supporting Adafruit nRF52, SAMD21, SAMD51, Arduino SAMD21 (Nano 33 IoT) so that those boards can be voice-controlled by Alexa

GitHub release

Why do we need this library

Many Web services require WebSockets library, which is so far written only for ESP8266/ESP32 boards. The ESP boards rely on this Markus Sattler’s WebSockets library to connect to Alexa via Sinric or SinricPro skills.

This library is based on and modified from WebSockets library to provide support to many boards such as Arduino SAMD21, Adafruit SAMD21/SAMD51, nRF52, STM32, etc. and enable those boards to use WebSockets services, including voice-control Alexa along with Blynk. The WebSockets can be used with ESP’s WiFi, WiFiNINA, W5x00 and ENC28J60 Ethernet.

Please see illustrating examples.

New in v2.2.1

  1. Bump up to sync with v2.2.1 of original WebSockets library

New in v2.1.3

  1. Add support to nRF52 boards, such as AdaFruit Feather nRF52832, nRF52840 Express, BlueFruit Sense, Itsy-Bitsy nRF52840 Express, Metro nRF52840 Express, NINA_B30_ublox, etc..
  2. Add support to SAM51 (Itsy-Bitsy M4, Metro M4, Grand Central M4, Feather M4 Express, etc.).
  3. Add support to SAMD21 (ZERO, MKR, NANO_33_IOT, M0, M0 Pro, AdaFruit CIRCUITPLAYGROUND_EXPRESS, etc.).

How to use

In your code, select one of the currently supported network connection from the following list:

  1. NETWORK_ESP8266_ASYNC for ESP8266 Async
  2. NETWORK_W5100 for W5x00 Ethernet
  3. NETWORK_ENC28J60 for ENC28J60 Ethernet
  4. NETWORK_ESP32 for ESP32 WiFi
  5. NETWORK_ESP32_ETH for ESP32 Ethernet

then add #define WEBSOCKETS_NETWORK_TYPE before #include <WebSocketsClient_Generic.h>

Example WebSocketClient_NINA


#include <WiFiNINA_Generic.h>

#include <WebSocketsClient_Generic.h>

//#include <Hash.h>

WebSocketsClient webSocket;

int status = WL_IDLE_STATUS;

///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = "****";        // your network SSID (name)
char pass[] = "********";    // your network password (use for WPA, or use as key for WEP), length must be 8+

void webSocketEvent(WStype_t type, uint8_t * payload, size_t length)
  switch (type)
    case WStype_DISCONNECTED:
      Serial.printf("[WSc] Disconnected!\n");
    case WStype_CONNECTED:
        Serial.printf("[WSc] Connected to url: %s\n", payload);

        // send message to server when Connected
    case WStype_TEXT:
      Serial.printf("[WSc] get text: %s\n", payload);

      // send message to server
      // webSocket.sendTXT("message here");
    case WStype_BIN:
      Serial.printf("[WSc] get binary length: %u\n", length);
      // KH, To check
      // hexdump(payload, length);

      // send data to server
      webSocket.sendBIN(payload, length);


void setup()
  //Initialize serial and wait for port to open:
  while (!Serial);

  Serial.println("Used/default SPI pinout:");

  // check for the WiFi module:
  if (WiFi.status() == WL_NO_MODULE)
    Serial.println("Communication with WiFi module failed!");
    // don't continue
    while (true);

  String fv = WiFi.firmwareVersion();
    Serial.println("Please upgrade the firmware");

  // attempt to connect to Wifi network:
  while (status != WL_CONNECTED)
    Serial.print("Attempting to connect to SSID: ");
    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
    status = WiFi.begin(ssid, pass);

    // wait 10 seconds for connection:

  // server address, port and URL
  webSocket.begin("", 81, "/");

  // event handler

  // use HTTP Basic Authorization this is optional remove if not needed
  webSocket.setAuthorization("user", "Password");

  // try ever 5000 again if connection has failed


void loop()

Debug Terminal Output when running SAMD_Blynk_NINA_Alexa

You can see the Arduino SAMD NANO_33_IoT board, with built-in WiFiNINA, connects to Blynk using Blynk_WiFiNINA_WM library.

It also uses WebSockets_Generic library to communicate with SINRIC skills, and Alexa, to control a relay using Alexa voice control of a Amazon Alexa phone APP

Start Blynk_WiFiNINA_WM using WiFiNINA_Shield on SAMD NANO_33_IOT
Start Blynk_WM
Flag read = 0xd0d04321
No doubleResetDetected
SetFlag write = 0xd0d01234
[21425] ======= Start Default Config Data =======
[21425] Hdr=NonSSL,BrdName=Air-Control
[21426] SSID=SSID1,PW=password1
[21426] SSID1=SSID2,PW1=password2
[21426] Server=account.ddns.net,Token=token
[21426] Server1=account.duckdns.org,Token1=token1
[21426] Port=8080
[21427] ======= End Config Data =======
[21427] Hostname=SAMD-WiFiNINA
[21427] bg: noConfigPortal = true
[21427] ChkCrR:CrCCsum=ef8,CrRCsum=ef8
[21428] CrCCSum=3832,CrRCSum=3832
[21428] ======= Start Stored Config Data =======
[21428] Hdr=SHD_WiFiNINA,BrdName=Air-Control
[21428] SSID=HueNet1,PW=****
[21429] SSID1=HueNet2,PW1=****
[21429] Server=account.ddns.net,Token=****
[21429] Server1=account.duckdns.org,Token1=****
[21429] Port=8080
[21429] ======= End Config Data =======
[21430] CCSum=0x3678,RCSum=0x3678
[21430] Hdr=SHD_WiFiNINA,BrdName=Air-Control
[21430] SSID=HueNet1,PW=****
[21430] SSID1=HueNet2,PW1=****
[21430] Server=account.ddns.net,Token=****
[21431] Server1=account.duckdns.org,Token1=****
[21431] Port=8080
[21431] ======= End Config Data =======
[21431] Connecting MultiWifi...
[22192] con2WF:spentMsec=761
WiFi-begin: return1 = 3
WiFi-begin: return2 = 3
[25451] con2WF:OK
[25452] IP =, GW =, SN =
[25453] b:WOK.TryB
    ___  __          __
   / _ )/ /_ _____  / /__
  / _  / / // / _ \/  '_/
 /____/_/\_, /_//_/_/\_\
        /___/ v0.6.1 on Arduino

[25454] BlynkArduinoClient.connect: Connecting to account.ddns.net:8080
[25488] Ready (ping: 5ms).
[25559] Con2BlynkServer=account.ddns.net,Token=****
[25559] b:WBOK
Stop doubleResetDetecting
ClearFlag write = 0xd0d04321

Your stored Credentials :
SINRIC API Key = ****
Device_ID1 = ****
[WSc] Service connected to sinric.com at url: /
Waiting for commands from sinric.com ...
[WSc] get text: {"deviceId":"****","action":"setPowerState","value":"ON"}
Turn on device id: ****
[WSc] get text: {"deviceId":"****","action":"setPowerState","value":"OFF"}
Turn off Device ID: ****