This command adds an unsigned byte to
the specified packet. An unsigned byte typically ranges from 0 to 255.
The data will be added starting at the cursor position and the cursor will be moved forward by the size of the data added.
long long int Packet: This is the packet that the command should use.
unsigned char: This is the data to be added.
0 if no error occurred.
-1 if an error occurred.
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