I am running the new code and found out 'wrong key!' error in the serial port window when running k-commands. Also when running a script in demos such as climbCeiling in python I got the same, though Petoi moves correctly for all other commands such as 'm', 'I',... Herewith attached screen shot of Arduino serial window and python terminal
thanks problem solvedin the wrapper of arterial.py, add ‘\n’ for ‘k’ can solve the problem.