BLE Tx App / BLE Rx Filtering. (#1543)

BLE TX app creation
BLE RX and TX app improvements

firmware/application/string_format.hpp

@@ -78,6 +78,7 @@ std::string to_string_file_size(uint32_t file_size);
 
 // Converts Mac Address to string.
 std::string to_string_mac_address(const uint8_t* macAddress, uint8_t length);
+std::string to_string_formatted_mac_address(const char* macAddress);
 
 /* Scales 'n' to be a value less than 1000. 'base_unit' is the index of the unit from
  * 'unit_prefix' that 'n' is in initially. 3 is the index of the '1s' unit. */