! :) hot reload of Garden IP setting when new IP advertised by garden controller over MQTT.

config/config.json

@@ -4,28 +4,28 @@
     "password": "!iot_popovi_nh",
     "database": "iot",
     "host": "192.168.0.10",
-    "port":"3306",
+    "port": "3306",
     "dialect": "mysql",
     "operatorsAliases": false,
-    "logFile":"/dht.log",
+    "logFile": "/dht.log",
-    "gardenIP":"192.168.0.42",
+    "gardenIP": "192.168.0.42",
     "mqttIP": "192.168.0.10",
     "mqttPortHttp": "1883",
     "mqttPortHttps": "1884",
     "irHost": "192.168.0.10",
-    "mqttEspName":"Garden",
+    "mqttEspName": "Garden",
-    "mqttWebappName":"iot.garden.dev"
+    "mqttWebappName": "iot.garden.dev"
   },
   "mitko": {
     "host": "node-mysql",
     "database": "iot",
     "username": "root",
     "password": "mitko2021",
-    "port":"3306",
+    "port": "3306",
     "dialect": "mysql",
     "operatorsAliases": false,
-    "logFile":"/dht.log",
+    "logFile": "/dht.log",
-    "gardenIP":"192.168.0.187",
+    "gardenIP": "192.168.0.187",
     "mqttIP": "192.168.0.10",
     "mqttPortHttp": "1884",
     "mqttPortHttps": "8444",
@@ -36,14 +36,14 @@
     "password": "!iot_popovi_nh",
     "database": "iot",
     "host": "192.168.0.10",
-    "port":"3304",
+    "port": "3304",
     "dialect": "mysql",
     "operatorsAliases": false,
-    "logFile":"/var/www/dht.log",
+    "logFile": "/var/www/dht.log",
-    "gardenIP":"192.168.0.187",
+    "gardenIP": "192.168.0.187",
     "mqttIP": "192.168.0.10",
     "mqttPortHttp": "1884",
     "mqttPortHttps": "8444",
     "irHost": "192.168.0.10"
   }
-}
+}

index.js

@@ -41,9 +41,10 @@ config.gardenIP = process.env.GARDEN_IP || config.gardenIP
 
 // defining HTTP endpoints
 app.get('/', (req, res) => {
-  res.send([
+  res.redirect('/garden');
-    {title: 'Hello, world (again)!'}
+  // res.send([
-  ]);
+  //   {title: 'Hello, world (again)!'}
+  // ]);
 });
 
 

src/mqtt.js

@@ -3,6 +3,7 @@ var db = require("./db");
 const env = process.env.NODE_ENV || "development";
 console.log("ENV: %s", env);
 
+var fs = require("fs");
 const path = require('path');
 const configPath = path.join(__dirname, '/../config/config.json');
 const config = require(configPath)[env];
@@ -43,10 +44,13 @@ console.log("MQTT: mqtt_settings.port : %s", mqtt_settings.port);
 // mqttServer.on('clientConnected', function(){
 //   console.log("MQTT client connected !");
 // });
-var EspDeviceName = process.env.MQTT_ESP_NAME;
+var EspDeviceName = process.env.MQTT_ESP_NAME || config.mqttEspName;
 
 var mqtt = require("mqtt");
-var mqtt_client = mqtt.connect("mqtt://" + mqtt_settings.host);
+var mqtt_client = mqtt.connect("mqtt://" + mqtt_settings.host,
+  {
+    clientId: process.env.MQTT_WEBAPP_NAME || config.mqttWebappName || "iot.garden.dev.local"
+  });
 mqtt_client.on("connect", function () {
   console.log("MQTT connected to " + mqtt_settings.host + ". subscribing to topics");
   mqtt_client.subscribe("tele/tasmota/STATE");
@@ -60,6 +64,7 @@ mqtt_client.on("connect", function () {
   // mqtt_client.subscribe('ir');
 
   //	ESP_Easy_0 = garden
+  console.log("subscribing to topics '" + EspDeviceName + "/'");
   mqtt_client.subscribe(EspDeviceName + "/+");
   mqtt_client.subscribe(EspDeviceName + "/+/+");
   mqtt_client.publish("tasmota", "controller connected");
@@ -173,27 +178,22 @@ mqtt_client.on("message", function (topic, message) {
       console.log("MQTT> unexpected json payload at /Water/stop:" + message);
     }
   }
-  if(topic === EspDeviceName + "/ping"){
+  if (topic === EspDeviceName + "/ping") {
-    try {     
+    try {
       console.log("MQTT> processing /ping message. Payload:" + context);
       var data = context.replace(/^\{|\}$/g, '').split('|');
-      var ip = data[4].replace(/"/g, ''); 
+      var ip = data[4].replace(/"/g, '');
-      console.log("got reporded garden controller IP: " + ip);
+      if (ip != config.gardenIP) {
-      console.log("MQTT> /ping got us " + data.length + "data items");
+        //console.log("MQTT> /ping got us " + data.length + " data items");
-      config.gardenIP = ip;      
+        config.gardenIP = ip;
-      
+        let newConfig = require(configPath);
-      
+        newConfig[env].gardenIP = ip;        
-      // Make a copy of config and change that
+        fs.writeFileSync(configPath, JSON.stringify(newConfig, null, 2));
-let newConfig = Object.assign({}, config);
+        console.log("Got NEW reporded garden controller IP: " + ip + ". new value stored in persistent settings storage");
-newConfig.gardenIP = ip;
+      }
-
-// Write the new config back to the original file
-fs.writeFileSync(configPath, JSON.stringify(newConfig, null, 2));
-
     } catch (e) {
-      console.log("MQTT> error at /ping: " + e);
+      console.log("MQTT> error processing /ping message: " + e);
     }
-
   }
 
   if (!handled) {