Publish refactoring (#298)

* factoring of the publishing function
* integration of json publishing to MQTT
* receiving and transcode json messages from mqtt
* replace the TRACE runtime condition by a buildtime one so as to decrease program size
* remove retainFlag parameter not necessary for the moment
* Increase the scope of tests for arduino mega and esp32
* Update arduinojson library to 5.13.3
* add macros to choose between simple or json publishing or both
* differentiate build test for ATmega2560
* correct wrong sprintf definition
* change IDE version for continuous integration
* let default warning level in arduino ide
* correct pins for ESP32
* reorganize user_config

config_BT.h

@@ -25,15 +25,6 @@
 */
 /*----------------------BT topics & parameters-------------------------*/
 #define subjectBTtoMQTT  Base_Topic Gateway_Name "/BTtoMQTT/"
-//#define subjectBTtoMQTTrssi "/rssi" // will be the default parameter on the next release, for the moment rssi is published on mac topic
-#define subjectBTtoMQTTrssi ""
-#define subjectBTtoMQTTtem "/tem"
-#define subjectBTtoMQTThum "/hum"
-#define subjectBTtoMQTTmoi "/moi"
-#define subjectBTtoMQTTfer "/fer"
-#define subjectBTtoMQTTlux "/lux"
-#define subjectBTtoMQTTbatt "/batt"
-#define subjectBTtoMQTTservicedata "/servicedata"
 #define TimeBtw_Read 55555 //define the time between 2 scans
 #define Scan_duration 10 //define the time for a scan
 #define HM-10 
@@ -42,11 +33,9 @@
 #define delimiter "4f4b2b444953413a"
 #define delimiter_length 16
 
-/*-------------------HOME ASSISTANT ROOM PRESENCE !!! ESP32 only !!!!----------------------*/
-#define roomPresence //Uncomment to enable 
-#ifdef roomPresence
-  #define subjectHomePresence "/homePresence/salon" // will send Home Assistant room presence message to this topic (first part is same for all rooms, second is room name)
-#endif
+/*-------------------HOME ASSISTANT ROOM PRESENCE ----------------------*/
+// if not commented Home presence integration with HOME ASSISTANT is activated
+#define subjectHomePresence  Base_Topic "/salon" // will send Home Assistant room presence message to this topic (first part is same for all rooms, second is room name)
 
 
 struct decompose