Re: EP's Perfect Haggle v.2016
Yes, you can't act on echos, though what may work is setDelayTrigger at the trade prompt, intending it to reset say, for example, 4-times longer than the average expected time to complete the trade, and if not the trigger fires and enters the send packet and then resets for the next round, also terminating when at the command prompt, resetting at the porting prompt, etc.