Marty with python - walk backward
I'm working with the martypy library and it is working fine so far. The "walk forward" runs, e.g. robot.walk(8). But how can I give a "walk backward" command? It must accept a negative int8-value. The command robot.walk(-4) gives an error message: (... ubyte should be in range 0...255). In general: How can be given negative int8-values to the martypi functions?