add mqtt publishing

platformio.ini

@@ -20,3 +20,4 @@ lib_deps =
 ;  SDS011 sensor Library
   https://github.com/Zanop/SDS011.git#more-sensor-modes
   RunningAverage
+  MQTT

src/main.cpp

@@ -14,6 +14,8 @@ extern "C" {
 
 #include <ESP8266HTTPClient.h>
 #include <ArduinoJson.h>
+#define MQTT_MAX_PACKET_SIZE 512
+#include <MQTTClient.h>
 
 #include <Wire.h>
 #include <SPI.h>
@@ -29,6 +31,10 @@ const char* server = "ingress.opensensemap.org";
 //const char* ssid = "Freifunk";
 //const char* password = "";
 
+const char* mqttserver = "home.xd0.de";
+const char* mqttusername = "esp-weatherstation";
+const char* mqttpassword = "password";
+
 constexpr unsigned int postingInterval = 60000; //Uploadintervall in Millisekunden
 constexpr unsigned int dhcp_interval = 60*60*1000;
 
@@ -97,7 +103,7 @@ struct __attribute__((packed)) SENSOR_DATA {
   float rssi;
 } sd;
 
-
+/*
 void sendESPNOW() {
 //  unsigned long espnowmillis = millis();
   uint8_t remoteMac[] = {0x5C, 0xCF, 0x7F, 0x5, 0xFD, 0xF0};
@@ -131,7 +137,7 @@ void sendESPNOW() {
   digitalWrite(LED_BUILTIN, HIGH);
 //  Serial.printf("sendESPNOW() took %d ms\n", millis()-espnowmillis);
 }
-
+*/
 
 void ICACHE_FLASH_ATTR sendValues() {
   sd.temperature = dht.readTemperature();
@@ -298,6 +304,34 @@ void ICACHE_FLASH_ATTR sendValues() {
 
   }
 
+  WiFiClientSecure net;
+  MQTTClient mqttclient;
+
+  mqttclient.begin(mqttserver, 8883, net);
+  int tries = 0;
+  constexpr unsigned int retry_delay = 500;
+  constexpr unsigned int max_retry_delay = 5000;
+  while (!mqttclient.connect(mqttusername, mqttusername, mqttpassword)) {
+    tries++;
+    Serial.print(".");
+    if (tries*retry_delay >= max_retry_delay) {
+      Serial.println(" [ERROR]");
+      Serial.println("Rebooting..");
+      ESP.restart();
+    }
+    delay(retry_delay);
+  }
+
+  mqttclient.loop();
+  Serial.println(buffer);
+  if (mqttclient.publish("sensor/esp-weatherstation/json", buffer, sizeof(buffer))) {
+    Serial.println("mqtt done");
+  } else {
+    Serial.println("mqtt failed");
+  }
+  mqttclient.loop();
+  mqttclient.disconnect();
+
   last_wifi_activity = millis();
   WiFi.disconnect();
   WiFi.mode(WIFI_OFF);