working mqtt over ethernet

platformio.ini

@@ -13,8 +13,16 @@ platform = espressif32
 board = esp32-poe-iso
 framework = arduino
 
+monitor_speed = 115200
+
+
+build_flags =
+    '-D MQTT_BASETOPIC="lightbutton_test"'
+
 lib_deps=
     ethernet
     BluetoothSerial
     SPI
     adafruit/Adafruit seesaw Library@^1.7.8
+    
+    adafruit/Adafruit MQTT Library@^2.5.8

src/main.cpp

@@ -3,6 +3,44 @@
 #include "Adafruit_NeoKey_1x4.h"
 #include "seesaw_neopixel.h"
 
+#include "Adafruit_MQTT.h"
+#include "Adafruit_MQTT_Client.h"
+
+
+/************************* WiFi Access Point *********************************/
+
+#define WLAN_SSID       "TheaterDo-ATD"
+#define WLAN_PASS       "PASSWORD"
+
+/************************* MQTT Setup *********************************/
+
+#define MQTT_SERVER      "nodered.atd.theaterdo.net"
+#define MQTT_SERVERPORT  1883                   // use 8883 for SSL
+
+#define MQTT_USERNAME    "__USERNAME__"
+#define MQTT_PASSWORD         "__PASSWORD__"
+
+
+static bool eth_connected = false;
+
+
+// Create an ESP8266 WiFiClient class to connect to the MQTT server.
+WiFiClient client;
+// or... use WiFiFlientSecure for SSL
+//WiFiClientSecure client;
+
+// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
+//Adafruit_MQTT_Client mqtt(&client, MQTT_SERVER, MQTT_SERVERPORT, MQTT_USERNAME, MQTT_PASSWORD);
+Adafruit_MQTT_Client mqtt(&client, MQTT_SERVER, MQTT_SERVERPORT);
+
+
+Adafruit_MQTT_Publish statusPub = Adafruit_MQTT_Publish(&mqtt, MQTT_BASETOPIC"/status");
+
+void WiFiEvent(WiFiEvent_t event);
+void MQTT_connect();
+
+
+bool nokey_enabled=false;
 Adafruit_NeoKey_1x4 neokey;  // Create the NeoKey object
 
 uint32_t Wheel(byte WheelPos);
@@ -34,11 +72,46 @@ void setup() {
   Serial.begin(115200);
   while (! Serial) delay(10);
 
+  
+  // Connect to WiFi access point.
+  /*
+  Serial.println(); Serial.println();
+  Serial.print("Connecting to ");
+  Serial.println(WLAN_SSID);
+
+  WiFi.begin(WLAN_SSID, WLAN_PASS);
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  Serial.println();
+
+  Serial.println("WiFi connected");
+  Serial.println("IP address: "); Serial.println(WiFi.localIP());
+  */
+
+   // Add a handler for network events. This is misnamed "WiFi" because the ESP32 is historically WiFi only,
+  // but in our case, this will react to Ethernet events.
+  Serial.print("Registering event handler for ETH events...");
+  WiFi.onEvent(WiFiEvent);
+  Serial.print("Starting ETH interface...");
+  ETH.begin();
+
+  // Send Hello World Notification
+  
+
+  
+
+  
   if (! neokey.begin(0x30)) {     // begin with I2C address, default is 0x30
     Serial.println("Could not start NeoKey, check wiring?");
-    while(1) delay(10);
+    nokey_enabled=false;
+  }else{
+    nokey_enabled=true;
   }
 
+  if (nokey_enabled) 
+  {
     Serial.println("NeoKey started!");
 
     // Pulse all the LEDs on to show we're working
@@ -57,16 +130,90 @@ void setup() {
     for(int i=0; i<NEOKEY_1X4_KEYS; i++){
       neokey.registerCallback(i, blink);
     }
+  }
+  
 }
 
 void loop() {
   // we handle all key events with the callbacks
+  if (nokey_enabled) 
+  {
     neokey.read();
+  }
+
+  static unsigned long last_status_send=0;
+  if (millis() - last_status_send > 1000){
+    last_status_send=millis();
+    if (!eth_connected){
+      Serial.println("Waiting for ethernet connection");
+    }else{
+      Serial.print(F("\nSending Hello!"));
+      Serial.print("...");
+      if (! statusPub.publish("Hello")) {
+        Serial.println(F("Failed"));
+      } else {
+        Serial.println(F("OK!"));
+      }
+    }
+  }
 
   delay(10);    // don't print too fast
 }
 
 
+// React to Ethernet events:-
+void WiFiEvent(WiFiEvent_t event)
+{
+  switch (event) {
+
+    case ARDUINO_EVENT_ETH_START:
+      // This will happen during setup, when the Ethernet service starts
+      Serial.println("ETH Started");
+      //set eth hostname here
+      ETH.setHostname("esp32-ethernet");
+      break;
+
+    case ARDUINO_EVENT_ETH_CONNECTED:
+      // This will happen when the Ethernet cable is plugged 
+      Serial.println("ETH Connected");
+      break;
+
+    case ARDUINO_EVENT_ETH_GOT_IP:
+    // This will happen when we obtain an IP address through DHCP:
+      Serial.print("Got an IP Address for ETH MAC: ");
+      Serial.print(ETH.macAddress());
+      Serial.print(", IPv4: ");
+      Serial.print(ETH.localIP());
+      if (ETH.fullDuplex()) {
+        Serial.print(", FULL_DUPLEX");
+      }
+      Serial.print(", ");
+      Serial.print(ETH.linkSpeed());
+      Serial.println("Mbps");
+      eth_connected = true;
+
+      MQTT_connect();
+
+
+      break;
+
+    case ARDUINO_EVENT_ETH_DISCONNECTED:
+      // This will happen when the Ethernet cable is unplugged 
+      Serial.println("ETH Disconnected");
+      eth_connected = false;
+      break;
+
+    case ARDUINO_EVENT_ETH_STOP:
+      // This will happen when the ETH interface is stopped but this never happens
+      Serial.println("ETH Stopped");
+      eth_connected = false;
+      break;
+
+    default:
+      break;
+  }
+}
+
 
 /******************************************/
 
@@ -84,3 +231,31 @@ uint32_t Wheel(byte WheelPos) {
   }
   return 0;
 }
+
+
+// Function to connect and reconnect as necessary to the MQTT server.
+// Should be called in the loop function and it will take care if connecting.
+void MQTT_connect() {
+  int8_t ret;
+
+  // Stop if already connected.
+  if (mqtt.connected()) {
+    return;
+  }
+
+  Serial.print("Connecting to MQTT... ");
+
+  uint8_t retries = 3;
+  while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
+    Serial.println(mqtt.connectErrorString(ret));
+    Serial.println("Retrying MQTT connection in 5 seconds...");
+    mqtt.disconnect();
+    delay(5000);  // wait 5 seconds
+    retries--;
+    if (retries == 0) {
+      // basically die and wait for WDT to reset me
+      while (1);
+    }
+  }
+  Serial.println("MQTT Connected!");
+}