add MQTT and OTA update support

platformio.ini

@@ -13,10 +13,11 @@ platform = espressif8266
 framework = arduino
 monitor_speed = 115200
 upload_speed = 500000
+upload_protocol = espota
+upload_port = led-marquee-sign.fablab.local
 
 # Serial1 (sign data) maps to D4 by default
 [env:d1_mini]
 board = d1_mini
-
-[env:nodemcuv2]
-board = nodemcuv2
+lib_deps = adafruit/Adafruit MQTT Library@^2.5.8
+lib_ignore = WiFi101

src/main.cpp

@@ -1,6 +1,11 @@
+#include <ESP8266WiFi.h>
 #include <ESP8266WiFiMulti.h>
 #include <ESP8266mDNS.h>
 #include <ESP8266WebServer.h>
+#include <WiFiUdp.h>
+#include <ArduinoOTA.h>
+#include "Adafruit_MQTT.h"
+#include "Adafruit_MQTT_Client.h"
 
 #include "credentials.h"
 #include "webserver.h"
@@ -10,6 +15,16 @@
 static ESP8266WiFiMulti wifiMulti;
 static SocketServer socketServer;
 
+#define AIO_SERVER      credentials::mqtt_hostname.c_str()
+#define AIO_SERVERPORT  credentials::mqtt_port
+#define AIO_USERNAME    credentials::mqtt_username.c_str()
+#define AIO_KEY         credentials::mqtt_password.c_str()
+WiFiClient client;
+Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);
+Adafruit_MQTT_Subscribe mqtt_subscribe_topic = Adafruit_MQTT_Subscribe(&mqtt, "homeassistant/marquee_sign/text");
+
+void MQTT_connect();
+
 void setup() {
     // serial console, for use via USB (also exposed to TXD0/RXD0 GPIOs)
     Serial.begin(115200);
@@ -20,7 +35,10 @@ void setup() {
     Serial1.begin(9600);
 
     // configure WiFi and connect to the network
+    WiFi.mode(WIFI_STA);
+    WiFi.hostname(credentials::mdnsHostname);
     wifiMulti.addAP(credentials::ssid.c_str(), credentials::psk.c_str());
+
     Serial.println("Connecting to Wi-Fi network...");
     while (wifiMulti.run() != WL_CONNECTED) {
         delay(1000);
@@ -32,16 +50,13 @@ void setup() {
     Serial.print(", IP address: ");
     Serial.println(WiFi.localIP());
 
+    ArduinoOTA.begin();
+
+    mqtt.subscribe(&mqtt_subscribe_topic);
+
     // might be handy to have the IP written on the sign
     sendTextToSign(WiFi.localIP().toString());
 
-    // publish this service using mDNS so that it's easy to find it in the LAN
-    if (MDNS.begin(credentials::mdnsHostname)) {
-        Serial.println("mDNS started up successfully");
-    } else {
-        Serial.println("Error: failed to start mDNS");
-    }
-
     // configure HTTP endpoints
     configureWebServer();
 
@@ -53,4 +68,40 @@ void setup() {
 void loop() {
     webServer.handleClient();
     socketServer.handleClient();
+
+    ArduinoOTA.handle();
+
+    MQTT_connect();
+
+    Adafruit_MQTT_Subscribe *subscription;
+    while ((subscription = mqtt.readSubscription(5000))) {
+        const char* signText = (char *)mqtt_subscribe_topic.lastread;
+
+        sendTextToSign(signText);
+    }
+}
+
+void MQTT_connect() {
+    int8_t ret;
+
+    // Stop if already connected.
+    if (mqtt.connected()) {
+        return;
+    }
+
+    uint8_t retries = 6;
+    while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
+        mqtt.disconnect();
+
+        // wait 10s till next try
+        for (int i = 0; i < 10000; i += 5) {
+            ArduinoOTA.handle();
+            delay(5);
+        }
+
+        retries--;
+        if (retries == 0) {
+            ESP.restart();
+        }
+    }
 }