Mqtt discovery (#320)

* add mqtt discovery (compatibile with home assistant) with omg status binary sensor & bme280 sensor

* added mqtt discovery to Test_config.h for ESP32 (ESP8266 & other boards was not tested)

* include support for ESP8266 & arduino mega

* fix getting MAC for esp8266

* esp8266 fix

* make mqtt discovery functions functions more generic, readable and easy to use & extend

* make mqtt discovery functions functions more generic, readable and easy to use & extend PART 2

* remove the macro for each attribute and supposing that if there is a bme280 we expose all

OpenMQTTGateway.ino

@@ -133,6 +133,9 @@
 #ifdef ZsensorGPIOKeyCode
   #include "config_GPIOKeyCode.h"
 #endif
+#ifdef ZmqttDiscovery
+  #include "config_mqttDiscovery.h"
+#endif
 
 /*------------------------------------------------------------------------*/
 
@@ -193,7 +196,7 @@ void saveConfigCallback () {
 }
 
 boolean reconnect() {
-  
+
   // Loop until we're reconnected
   while (!client.connected()) {
       trc(F("MQTT connection...")); //F function enable to decrease sram usage
@@ -204,6 +207,11 @@ boolean reconnect() {
       pub(will_Topic,Gateway_AnnouncementMsg,will_Retain);
       // publish version
       pub(version_Topic,OMG_VERSION,will_Retain);
+      //home assistant discovery
+      #ifdef ZmqttDiscovery
+      pubMqttDiscovery();
+      #endif
+
       //Subscribing to topic
       if (client.subscribe(subjectMQTTtoX)) {
         #ifdef ZgatewayRF
@@ -783,6 +791,9 @@ void stateMeasures(){
       #ifdef ZsensorGPIOKeyCode
           modules = modules  + ZsensorGPIOKeyCode;
       #endif
+      #ifdef ZmqttDiscovery
+          modules = modules  + ZmqttDiscovery;
+      #endif
       SYSdata["modules"] = modules;
       trc(modules);
       char JSONmessageBuffer[100];

User_config.h

@@ -95,6 +95,7 @@ char mqtt_port[6] = "1883";
 //#define ZgatewayRFM69  "RFM69"    //ESP8266, Arduino, ESP32
 //#define ZsensorGPIOKeyCode "GPIOKeyCode" //ESP8266, Arduino, ESP32
 //#define ZsensorGPIOInput "GPIOInput" //ESP8266, Arduino, ESP32
+#define ZmqttDiscovery "HADiscovery"//ESP8266, Arduino, EPS32, Sonoff RF Bridge
 
 /*-------------DEFINE YOUR ADVANCED NETWORK PARAMETERS BELOW----------------*/
 //#define MDNS_SD //uncomment if you  want to use mdns for discovering automatically your ip server, please note that MDNS with ESP32 can cause the BLE to not work
@@ -116,13 +117,13 @@ const byte subnet[] = { 255, 255, 255, 0 }; //ip adress
 #define will_Topic  Base_Topic Gateway_Name "/LWT"
 #define will_QoS 0
 #define will_Retain true
-#define will_Message "Offline"
-#define Gateway_AnnouncementMsg "Online"
+#define will_Message "offline"
+#define Gateway_AnnouncementMsg "online"
 
 #define jsonPublishing true //comment if you don't want to use Json  publishing  (one topic for all the parameters)
 //example home/OpenMQTTGateway_ESP32_DEVKIT/BTtoMQTT/4XXXXXXXXXX4 {"rssi":-63,"servicedata":"fe0000000000000000000000000000000000000000"}
 
-#define simplePublishing true //comment if you don't want to use simple publishing (one topic for one parameter)
+//#define simplePublishing true //comment if you don't want to use simple publishing (one topic for one parameter)
 //example 
 // home/OpenMQTTGateway_ESP32_DEVKIT/BTtoMQTT/4XXXXXXXXXX4/rssi -63.0
 // home/OpenMQTTGateway_ESP32_DEVKIT/BTtoMQTT/4XXXXXXXXXX4/servicedata fe0000000000000000000000000000000000000000
@@ -162,7 +163,7 @@ const byte subnet[] = { 255, 255, 255, 0 }; //ip adress
   #define multiCore //comment to don't use multicore function of ESP32 for BLE
 #endif
 
-#define JSON_MSG_BUFFER 256 // Json message max buffer size, don't put 1024 or higher it is causing unexpected behaviour on ESP8266
+#define JSON_MSG_BUFFER 512 // Json message max buffer size, don't put 1024 or higher it is causing unexpected behaviour on ESP8266
 
 #define TimeBetweenReadingSYS 120000 // time between system readings (like memory)
 #define subjectSYStoMQTT  Base_Topic Gateway_Name "/SYStoMQTT"

ZmqttDiscovery.ino

@@ -0,0 +1,166 @@
+/*
+  OpenMQTTGateway Addon  - ESP8266 or Arduino program for home automation
+
+   Act as a wifi or ethernet gateway between your 433mhz/infrared IR signal  and a MQTT broker
+   Send and receiving command by MQTT
+
+   This is the Home Assistant mqtt Discovery addon.
+
+    Copyright: (c) Rafal Herok
+
+    This file is part of OpenMQTTGateway.
+
+    OpenMQTTGateway is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenMQTTGateway is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifdef ZmqttDiscovery
+
+void pubMqttDiscovery()
+{
+#ifdef omgStatus
+  trc(F("omgStatusDiscovery"));
+  createDiscovery("binary_sensor",                                      //set sensorType
+                  will_Topic, DEVICENAME, getUniqueId("omg", "status"), //set state_topic,name,uniqueId
+                  "", "connectivity", "",                               //set availability_topic,device_class,value_template,
+                  Gateway_AnnouncementMsg, will_Message, "",            //set,payload_on,payload_off,unit_of_meas,
+                  true, false, 0);                                      //set optimistic,retain, off_delay
+#endif
+#ifdef discBme280
+  trc(F("bme280Discovery"));
+  createDiscovery("sensor",
+                  BME, "tempc", getUniqueId("bme", "tempc"),
+                  will_Topic, "temperature", "{{ value_json.tempc }}",
+                  "", "", "°C",
+                  true, false, 0);
+  createDiscovery("sensor",
+                  BME, "tempf", getUniqueId("bme", "tempf"),
+                  will_Topic, "temperature", "{{ value_json.tempf }}",
+                  "", "", "°F",
+                  true, false, 0);
+  createDiscovery("sensor",
+                  BME, "pa", getUniqueId("bme", "pa"),
+                  will_Topic, "pressure", "{{ float(value_json.pa) * 0.01 }}",
+                  "", "", "hPa",
+                  true, false, 0);
+  createDiscovery("sensor",
+                  BME, "hum", getUniqueId("bme", "hum"),
+                  will_Topic, "humidity", "{{ value_json.hum }}",
+                  "", "", "%",
+                  true, false, 0);
+  createDiscovery("sensor",
+                  BME, "altim", getUniqueId("bme", "altim"),
+                  will_Topic, "", "{{ value_json.altim }}",
+                  "", "", "m",
+                  true, false, 0);
+  createDiscovery("sensor",
+                  BME, "altift", getUniqueId("bme", "altift"),
+                  will_Topic, "", "{{ value_json.altift }}",
+                  "", "", "ft",
+                  true, false, 0);
+#endif
+}
+
+void createDiscovery(String sensor_type,
+                     String state_topic, String name, String unique_id,
+                     String availability_topic, String device_class, String value_template,
+                     String payload_on, String payload_off, String unit_of_meas,
+                     bool optimistic, bool retain, int off_delay)
+{
+  StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer3;
+  JsonObject &sensor = jsonBuffer3.createObject();
+  sensor.set("stat_t", state_topic); //state_topic
+  sensor.set("name", name);          //name
+  sensor.set("uniq_id", unique_id);  //unique_id
+  if (availability_topic != "")
+  {
+    sensor.set("avty_t", availability_topic); //availability_topic
+  }
+  if (device_class != "")
+  {
+    sensor.set("dev_cla", device_class); //device_class
+  }
+  if (value_template != "")
+  {
+    sensor.set("val_tpl", value_template); //value_template
+  }
+  if (payload_on != "")
+  {
+    sensor.set("pl_on", payload_on); // payload_on
+  }
+  if (payload_off != "")
+  {
+    sensor.set("pl_off", payload_off); //payload_off
+  }
+  if (unit_of_meas != "")
+  {
+    sensor.set("unit_of_meas", unit_of_meas); //unit_of_measurement
+  }
+  if (optimistic != true)
+  {
+    sensor.set("opt", optimistic); //optimistic
+  }
+  if (retain != false)
+  {
+    sensor.set("ret", retain); //retain
+  }
+  if (off_delay > 0)
+  {
+    sensor.set("off_delay", off_delay); //off_delay
+  }
+
+  char JSONmessageBuffer[JSON_MSG_BUFFER];
+  StaticJsonBuffer<JSON_MSG_BUFFER> jsonDeviceBuffer;
+  JsonObject &device = jsonDeviceBuffer.createObject();
+  device.set("name", DEVICENAME);
+  device.set("manufacturer", DEVICEMANUFACTURER);
+  device.set("sw_version", OMG_VERSION);
+  JsonArray &identifiers = device.createNestedArray("identifiers");
+  identifiers.add(getMacAddress());
+
+  sensor.set("device", device); //device sensor is connected to
+
+  String topic = (String)discovery_Topic + "/" + sensor_type + "/" + unique_id + "/config";
+  pubDiscovery(topic, sensor);
+}
+
+void pubDiscovery(String topicori, JsonObject &data)
+{
+  char JSONmessageBuffer[JSON_MSG_BUFFER];
+  trc(F("Pub json into:"));
+  trc(topicori);
+  data.printTo(JSONmessageBuffer, sizeof(JSONmessageBuffer));
+  trc(JSONmessageBuffer);
+  client.publish((char *)topicori.c_str(), JSONmessageBuffer, true);
+}
+
+String getMacAddress()
+{
+  uint8_t baseMac[6];
+#ifdef ESP8266
+  WiFi.macAddress(baseMac);
+#else
+  esp_read_mac(baseMac, ESP_MAC_WIFI_STA);
+#endif
+  char baseMacChr[13] = {0};
+  sprintf(baseMacChr, "%02X%02X%02X%02X%02X%02X", baseMac[0], baseMac[1], baseMac[2], baseMac[3], baseMac[4], baseMac[5]);
+  return String(baseMacChr);
+}
+
+String getUniqueId(String name, String sufix)
+{
+  String uniqueId = (String)getMacAddress() + name + sufix;
+  return String(uniqueId);
+}
+
+#endif

config_mqttDiscovery.h

@@ -0,0 +1,32 @@
+/*
+  OpenMQTTGateway  - ESP8266 or Arduino program for home automation
+
+   Act as a wifi or ethernet gateway between your 433mhz/infrared IR signal  and a MQTT broker
+   Send and receiving command by MQTT
+
+   This files enables to set your parameter for the Home assistant mqtt Discovery
+
+    Copyright: (c) Rafal Herok
+
+    This file is part of OpenMQTTGateway.
+
+    OpenMQTTGateway is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenMQTTGateway is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+#define discovery_Topic "homeassistant"
+#define omgStatus //uncomment to create OMG status sensor
+#define discBme280 //uncomment to enable bme280 sensors
+
+#define DEVICENAME "OpenMQTTGateway " Gateway_Name
+#define DEVICEMANUFACTURER "AnimaVitis"

tests/Test_config.h

@@ -129,6 +129,7 @@ const byte subnet[] = { 255, 255, 255, 0 }; //ip adress
   #define ZgatewayRFM69 "RFM69"// If you uncomment this you can't use RF and BT due to the fact that RF use also D8 and BT use also D6/D7
   #define ZsensorGPIOInput "GPIOInput"
   #define ZsensorGPIOKeyCode "GPIOKeyCode"
+  #define ZmqttDiscovery "HADiscovery"//ESP8266, Arduino, EPS32, Sonoff RF Bridge
   #define jsonPublishing true
   #define simplePublishing true
 #elif ESP32
@@ -149,6 +150,7 @@ const byte subnet[] = { 255, 255, 255, 0 }; //ip adress
   #define ZgatewayRFM69 "RFM69"
   #define ZsensorGPIOInput "GPIOInput"
   #define ZsensorGPIOKeyCode "GPIOKeyCode"
+  #define ZmqttDiscovery "HADiscovery"//ESP8266, Arduino, EPS32, Sonoff RF Bridge
   #define jsonPublishing true
   #define simplePublishing true
 #elif defined(__AVR_ATmega1280__)
@@ -171,6 +173,7 @@ const byte subnet[] = { 255, 255, 255, 0 }; //ip adress
   #define ZgatewayRFM69 "RFM69"// If you uncomment this you can't use RF and BT due to the fact that RF use also D8 and BT use also D6/D7
   #define ZsensorGPIOInput "GPIOInput"
   #define ZsensorGPIOKeyCode "GPIOKeyCode"
+  #define ZmqttDiscovery "HADiscovery"//ESP8266, Arduino, EPS32, Sonoff RF Bridge
   #define jsonPublishing true
   #define simplePublishing true
 #else // for arduino Uno