Only send one command at a time.

[JamesNewton]

DexRun.c (on the robot) only processes one command at a time and signals completion by returning a status. Your current send command doesn't check that the status has been returned before it sends the next command. If you send a command that takes a bit to complete, then send another command, it will miss the second command, or try to execute it when the first is still working. You should change the send command so it queues up commands, and sends each one after the prior commands status has been returned.