I would like to announce that I stumbled upon something that I considered a MAJOR bug, during a project using playSMS 1.2.1. The bug was causing most of the SMS sent more than once, I saw twice but it could be more.
I think I know why. I suspect the way playSMS daemon send the SMS to gateways were coded wrongly.
A fix is on the way. I suggest NOT to use playSMS 1.2 and above until next release, 1.3 is available.
Sorry for the trouble. Discuss here.