OK, but remember that the GSM module will draw more power than the USB port can supply.
Yes, thanks.
The set up is running from a 12v 2.5a Supply, into Vin.
The Unit will always send the first SMS without a problem.
The second and subsequent SMS's fail with a error message from the SM5100.
The error is as listed before CME Error 4 (an unknown command error).
I can still query the unit, and get an answer, using other queries, like AT and I get OK.
There is something I cant find getting in the way of the next message.
Like an unfinished command getting fed into the sm5100 before I start the SMS sending loop.
Does any one have a working code example?
IE push a button and send an SMS.
I would love to see one, and test with my hardware.
MH