RE: GSM Modems

[Michael Hutchinson]

Sorry about the delayed reply.

Message received: 0x21 / 0x0047
04 c4 80 39 31 30 36 32 31 30 30 30 30 31 30 46 |    910621000010F
35 31 31 30 30 30 41 38 31 31 30 33 32 32 36 38 | 511000A811032268
35 34 38 30 30 30 30 41 41 30 34 44 34 46 32 39 | 5480000AA04D4F29
43 30 45 0d 0a 2b 43 4d 53 20 45 52 52 4f 52 3a | C0E  +CMS ERROR:
20 35 30 33 30 34 0d                            |  50304
Received message type 21
SMS Send failed (Unknown error - well better than nothing!!)
Serial device: closing device

CMS Error.. for some reason you're failing to send text. It might be
because of the network, or your Sim Card has run out of money.. I mean
it worked, and now it has stopped, and it looks like something external
- perhaps your TelCo can help, they may be able to see a reason for
failure.

I suggest that swapping the SIM card in the modem with another known
working one may pinpoint the issue for you.

Cheers,
Michael