I have problem with communication over RS232.
Modem is used to sending SMS messages, approx 5 per day.
Modem has factory settings, just echo is switched off.
Sometimes modem simply stops to communicate.
This happen sometimes after 3 weeks and sometimes after 2 days.
When serial link stops to communicate, i dont get response to any AT command.
And i have to restart modem(cycle power).
I tried several firmwares, but without succes.
Does anybody have similar problem or idea how to solve it?