There's something wrong in AT2 code :( I haven't yet checked the code, but changing config file to AT solved my problem.
I'm receiving sms through M20 and AT2 and receive and send through EMI (emi2). EVERYTHING is working correctly but AT2 thread is eating 99% of my cpu. (even receiving sms's with no delay whatsovever) (99% of my cpu to bearerbox? no way. It's already reserved to dnetc :))))))))
