reworks because of 'tx_mode 2' and protocol issues

° added markers (GIO12, GPIO14) for logic analyzer debugging

° change UART initialisation
  - set RxFIFO full to 1 char, so we can detect active telegram on EMS-Bus
  - set RxTOT to 1 char for the same reason

° in ems_parseTelegram: ignore telegram if  emsRxStatus != EMS_RX_STATUS_IDLE
  because we missed to respond in a timely manner

° ems_tx_buffer is not void anymore, instead we return the Tx status
° extended the emsTxStatus
  - EMS_TX_WTD_TIMEOUT: timeout while waiting for echo of last Tx byte
    out telegram was ignored by the bus master, so the byte wasn't echoed
  - EMS_TX_BRK_DETECT:  BRK detected while sending the telegram
    bus master send us a break because of protocol violation

° add burnStarts, burnWorkMin and heatWorkMin to MQTT boiler message

TODO:
  + take care of ems_tx_buffer return code
  + accept direct telegram in ems_parse_telegram and do a proper acknowledge
  + split the heartbeat in static (version, IP-address) and dynamic (RSS etc)
  + change the hearbeat to a JSON structure so we can easier pick the uptime

src/my_config.h

@@ -84,10 +84,15 @@
 // can be enabled and disabled via the 'set led' command and pin set by 'set led_gpio'
 #define EMSESP_LED_GPIO LED_BUILTIN
 
+#ifdef LOGICANALYZER
+#define EMSESP_DALLAS_GPIO D1
+#define EMSESP_DALLAS_PARASITE false
+#else
 // set this if using an external temperature sensor like a DS18B20
 // D5 is the default on a bbqkees board
 #define EMSESP_DALLAS_GPIO D5
 #define EMSESP_DALLAS_PARASITE false
+#endif
 
 // By default the EMS bus will be scanned for known devices based on the product ids in ems_devices.h
 // You can override the Thermostat and Boiler types here