added example

examples/example-mqtt-ws.ino

@@ -0,0 +1,77 @@
+#include <ESP8266WiFi.h>
+#include <WiFiClientSecure.h>
+#include <PubSubClient.h>
+#include "WebSocketStreamClient.h"
+#include "WebSocketClient250.h"
+
+#define DEBUG_MAIN(...) Serial.printf(__VA_ARGS__)
+
+#ifndef DEBUG_MAIN
+#define DEBUG_MAIN(...)
+#endif
+
+// config
+const char *ssid = "YOURSSID";
+const char *password = "YOURPASSWORD";
+const char *host = (char *)"web-socket-mqtt.herokuapp.com";
+const int port = 443;
+const char *fingerprint = "08 3B 71 72 02 43 6E CA ED 42 86 93 BA 7E DF 81 C4 BC 62 30";
+const char *path = (char *)"/mqtt";
+
+// globals
+unsigned int counter = 0;
+unsigned long lastPublishTime = 0;
+unsigned long publishInterval = 1000;
+uint8_t buffer[1000];
+
+void onMqttPublish(char *topic, byte *payload, unsigned int length)
+{
+  DEBUG_MAIN("received %s %.*s\n", topic, length, payload);
+}
+
+WiFiClientSecure wiFiClient;
+WebSocketClient250 wsClient(wiFiClient, host, port);
+WebSocketStreamClient wsStreamClient(wsClient, path);
+PubSubClient mqtt(wsStreamClient);
+
+void setup()
+{
+  Serial.begin(9600);
+  delay(2000);
+
+  DEBUG_MAIN("WiFi connecting to %s\n", ssid);
+  WiFi.disconnect();
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED)
+  {
+    DEBUG_MAIN(".");
+    delay(500);
+  }
+  DEBUG_MAIN("\nWiFi connected to %s\n", WiFi.SSID().c_str());
+
+  wiFiClient.setFingerprint(fingerprint);
+  mqtt.setCallback(onMqttPublish);
+
+  DEBUG_MAIN("mqtt connecting\n");
+  if (mqtt.connect("topic1"))
+  {
+    DEBUG_MAIN("mqtt connected OK\n");
+    mqtt.publish("log", "hello world");
+    mqtt.subscribe("topic1");
+  }
+}
+
+void loop()
+{
+  mqtt.loop();
+  if (lastPublishTime + publishInterval < millis())
+  {
+    lastPublishTime = millis();
+    DEBUG_MAIN("tick %d\n", ++counter);
+    if (mqtt.connected())
+    {
+      String msg = (String("esp8266 counter ") + String(counter));
+      mqtt.publish("log", msg.c_str());
+    }
+  }
+}