Hi Thi is very weird. I use minicom to use at commands. The configuration is the following:
Serial Device : /dev/ttyUSB0 Lockfile Location : Callin Program : Callout Program : Bps/Par/Bits : 115200 8N1 Hardware Flow Control : No Software Flow Control : No I use speed=115200 and device =/dev/ttyUSB0 in the configuration of my bearerbox but i have not result.