[TagVal] Change serial number from integer to string

Author: vzahradnik

content/_index.md

@@ -126,8 +126,8 @@ Remote connectivity settings:
 
 Should you need serial number management, (IE you have more than one board):
 
-* `TC_MANUAL_SERIAL_NO_IMPL` indicate that you want to implement `uint32_t getBoardSerialNumber()` yourself
-* `TC_BOARD_SERIAL_NO` long 32 bit integer containing the board serial number. Defaults to `999999999L`
+* `TC_MANUAL_SERIAL_NO_IMPL` indicate that you want to implement `const char * getBoardSerialNumber()` yourself
+* `TC_BOARD_SERIAL_NO` string literal containing the board serial number. Defaults to `999999999`
 
 Drawing specific:
 

content/arduino-libraries/tc-menu/tcmenu-iot/embed-control-tagval-wire-protocol.md

@@ -118,7 +118,7 @@ Field definitions:
 | VE    | Version  | The version of the sender       |
 | PF    | Platform | The platform of the sender      |
 | UU    | UUID     | The UUID of the remote app      |
-| US    | Integer  | The serial number of the remote |
+| US    | String   | The serial number of the remote |
 
 ### Heartbeat Message (Type HB)