add wqtt initialization

include/wifi_functions.h

@@ -0,0 +1,43 @@
+
+#ifndef _WIFI_FUNCTIONS_H_
+#define _WIFI_FUNCTIONS_H_
+
+#include <WiFi.h>
+#include <MQTT.h>
+
+#include "wifi_settings.h"
+
+
+WiFiClient net;
+MQTTClient client;
+
+void connect() {
+  Serial.print("checking wifi...");
+  while (WiFi.status() != WL_CONNECTED) {
+    Serial.print(".");
+    delay(1000);
+  }
+
+  Serial.print("\nconnecting...");
+  while (!client.connect(client_id, "public", "public")) {
+    Serial.print(".");
+    delay(1000);
+  }
+
+  Serial.println("\nconnected!");
+
+  client.subscribe("/hello");
+  // client.unsubscribe("/hello");
+}
+
+
+void messageReceived(String &topic, String &payload) {
+  Serial.println("incoming: " + topic + " - " + payload);
+
+  // Note: Do not use the client in the callback to publish, subscribe or
+  // unsubscribe as it may cause deadlocks when other things arrive while
+  // sending and receiving acknowledgments. Instead, change a global variable,
+  // or push to a queue and handle it in the loop after calling `client.loop()`.
+}
+
+#endif

include/wifi_settings.h

@@ -0,0 +1,6 @@
+
+const char ssid[] = "ssid";
+const char pass[] = "pass";
+const char mqtt_host[] = "10.0.0.1";
+
+const char client_id[] = "hydroponic";

platformio.ini

@@ -20,3 +20,4 @@ lib_deps =
     d03n3rfr1tz3/HC-SR04@^1.1.2
     https://github.com/emilv/ArduinoSort/
     robtillaart/ADS1X15@^0.3.9
+    256dpi/MQTT@^2.5.1

src/main.cpp

@@ -1,5 +1,9 @@
 #include <Arduino.h>
 
+
+#include "wifi_functions.h"
+
+
 bool debug=true; //print Serial information
 
 #include "helpfunctions.h"
@@ -44,6 +48,10 @@ void setup() {
   pinMode(PIN_LED,OUTPUT);
   digitalWrite(PIN_LED,LOW);
   Serial.begin(115200);
+  WiFi.begin(ssid, pass);
+  client.begin(mqtt_host, net);
+  client.onMessage(messageReceived);
+  connect();
 
   //init ADS1115
   if (!ADS.begin()) {