This command gets a long double from
the specified packet. Typically long doubles are 8 bytes in size and
range from 1.79769e+308 to 2.22507e-308.
The data will be taken starting at the cursor position and the cursor will be moved forward by the size of the data returned.
long long int Packet: This is the packet that the command should use.
Data from the specified packet if no
error occurred.
0 if an error occurred.
C++