Troubleshoot The Problem Of Wifi Module 4g Internet Access

1. Connect to the WIFI hotspot of the corresponding module, and use telnet to enter the management interface.

 2. Use ls /dev/ttyUSB* to check whether the 4G module is connected properly. If it is the following situation, the 4G module is not connected properly.

3. In one terminal window, type cat /dev/ttyUSB2 and press Enter; in the other, type the corresponding AT command, such as:

echo -e ”at\r\n” > /dev/ttyUSB2 //Check whether the at command can be returned correctly;

echo -e ”at+cpin?\r\n” > /dev/ttyUSB2 //Check whether the card is inserted

echo -e "at+csq\r\n" > /dev/ttyUSB2 //Check signal strength

If you use the gateway version 2.0, you can use it by opening only one terminal:

atcmd /dev/ttyUSB2 115200 at to query