mqtt for irrigation

irrigation/platformio.ini

@@ -15,4 +15,6 @@ framework = arduino
 monitor_speed = 9600
 upload_port = /dev/ttyUSB0
 lib_deps = 
-	tzapu/WiFiManager@^0.16.0
+	tzapu/WiFiManager@^0.16.0
+	knolleary/PubSubClient@^2.8
+	bblanchon/ArduinoJson@^6.17.3

irrigation/src/.gitignore

@@ -0,0 +1 @@
+config.h

irrigation/src/config.h.example

@@ -0,0 +1,16 @@
+#ifndef __CONFIG_H__
+#define __CONFIG_H__
+/**
+ * For project specific settings. Copy to config.h and place your settings there.
+ **/
+
+const char *MQTT_BROKER = "192.168.178.74";
+const char *MQTT_TF_TOPIC = "greenhousino/pump";
+const char *MQTT_CLIENT_ID = "greenhousino/pump";
+
+const char *MQTT_LAST_WILL_TOPIC = "greenhousino/pump/status";
+const char *MQTT_LAST_WILL_MSG = "offline";
+const char *MQTT_CLIENT_USER = "NULL"; // if NULL, no username or password is used
+const char *MQTT_CLIENT_PW = "NULL";   // if NULL, no password is used
+
+#endif

irrigation/src/main.cpp

@@ -7,19 +7,29 @@
 
 #include "WebContent.h"
 
+#include <PubSubClient.h> //MQTT
+#include <ArduinoJson.h>
+
 #define RelaisPin D4 // Relais
 #define SwitchPin D1 // Active Low, Switch between D1 and GND
 
 #define R_ON 0// active Low = 0, otherwise 1
 #define R_OFF 1// active Low = 1, otherwise 0
 
+#include "config.h"
+
+
 ESP8266WebServer server(80); // Create a webserver object that listens for HTTP request on port 80
 
+//MQTT
+WiFiClient espClient;
+PubSubClient mqttClient(MQTT_BROKER, 1883, espClient);
+
 // time in millis the pump has been started
 long pumpStarted = 0;
 
 // Max time the pump is active
-#define PUMP_ACTIVE_MILLIS 20000
+#define PUMP_ACTIVE_MILLIS 30000
 
 void handleRoot(); // function prototypes for HTTP handlers
 void handleOn();
@@ -30,6 +40,9 @@ void handleState();
 void deactivatePump();
 void activatePump();
 
+void mqtt_callback(char* inTopic, byte* payload, unsigned int length);
+void reconnect();
+
 void configModeCallback(WiFiManager *myWiFiManager)
 {
   Serial.println("Entered config mode");
@@ -71,6 +84,8 @@ void setup()
   //if you get here you have connected to the WiFi
   Serial.println("connected...yeey :)");
 
+  mqttClient.setCallback(mqtt_callback);
+
   server.on("/", handleRoot);        // Call the 'handleRoot' function when a client requests URI "/"
   server.on("/on", handleOn); 
   server.on("/off", handleOff); 
@@ -86,11 +101,63 @@ void setup()
 void loop()
 {
   server.handleClient(); // Listen for HTTP requests from clients
-  if (millis()-pumpStarted>PUMP_ACTIVE_MILLIS) {
+
+  if (!mqttClient.connected())
+  {
+    reconnect();
+  }
+  mqttClient.loop();
+
+
+  if (millis()-pumpStarted>PUMP_ACTIVE_MILLIS && digitalRead(RelaisPin) == R_ON) {
     deactivatePump();
   }
 }
 
+void reconnect()
+{
+  // Loop until we're reconnected
+  while (!mqttClient.connected())
+  {
+    Serial.println("INFO: Attempting MQTT connection...");
+    // Attempt to connect
+    if (mqttClient.connect(MQTT_CLIENT_ID))
+    {
+      Serial.println("INFO: connected");
+      mqttClient.subscribe(MQTT_TF_TOPIC);
+    }
+    else
+    {
+      Serial.print("ERROR: failed, rc=");
+      Serial.print(mqttClient.state());
+      Serial.println("DEBUG: try again in 5 seconds");
+      // Wait 5 seconds before retrying
+      delay(5000);
+    }
+  }
+}
+
+void mqtt_callback(char* inTopic, byte* payload, unsigned int length){
+  Serial.println("Got RF data");
+  Serial.write(payload, length);
+  Serial.println();
+  
+  // convert the byte non terminated payload to string:
+  char pltext[length+1];
+  strncpy(pltext, (char*)payload, length);
+  pltext[length]='\0';
+  // convert payload string to int:
+  if (String(pltext)=="on") {
+    activatePump();
+  } else if (String(pltext)=="off") {
+    deactivatePump();
+  } else {
+    Serial.println("mqtt payload unknown!");
+  }
+
+  Serial.println("RF data sent");
+}
+
 void handleRoot()
 {
   server.send(200, "text/html", index_html);
@@ -99,17 +166,18 @@ void handleRoot()
 void activatePump() {
   pumpStarted = millis();
   digitalWrite(RelaisPin, R_ON);
+  Serial.println("Pump activated");
 }
 
 void deactivatePump() {
   digitalWrite(RelaisPin, R_OFF);
+  Serial.println("Pump deactivated");
 }
 
 void handleOn()
 {
   activatePump();
   server.send(200, "text/plain", "on");
-  
 }
 
 void handleOff()