Support for changing CC1101 Receive and Transmit Frequency (#847)

* Support for changing CC1101 Receive and Transmit Frequency

* Docs

* Resolve feedback

* Update Somfy module to use Global receiveMhz

ELECHOUSE_cc1101.SpiStrobe(CC1101_SIDLE); // Idle receiver prior to
setting a new frequency

main/User_config.h

@@ -384,6 +384,8 @@ uint8_t wifiProtocol = 0; // default mode, automatic selection
 #define subjectMQTTtoSYSset          "/commands/MQTTtoSYS/config"
 
 /*-------------------DEFINE LOG LEVEL----------------------*/
-#define LOG_LEVEL LOG_LEVEL_NOTICE
-
+#ifndef LOG_LEVEL
+#  define LOG_LEVEL LOG_LEVEL_NOTICE
 #endif
+
+#endif