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→AT command usage
To use a specific AT command via SSH, you can use the ''gsmctl -H''. After this your console will enter shell mode where you can then just type AT commands in their regular format. Or you can use ''gsmctl -A <AT_COMMAND>'' to execute AT commands one at a time. Continuing from the example above, lets say you want to find out the RSSI value. While there are quite a few commands that can be used to achieve this goal, lets use the '''AT+CSQ''' that is used when executing ''gsmctl -q'':
To use a specific AT command via SSH, you can use the ''gsmctl -H''. After this your console will enter shell mode where you can then just type AT commands in their regular format. Or you can use ''gsmctl -A <AT_COMMAND>'' to execute AT commands one at a time. Continuing from the example above, lets say you want to find out the RSSI value. While there are quite a few commands that can be used to achieve this goal, lets use the '''AT+CSQ''' that is used when executing ''gsmctl -q'':
[[File:At csq.png]]
As you can see this time the command returns two values instead of one, and they don't directly represent the RSSI value as with ''gsmctl -q''. The reason for this is that AT+CSQ indicates the received signal strength '''<rssi>''' and the channel bit error rate '''<ber>''' and the numbers returned are not the direct values but rather the representation of the direct values.
<rssi>
0 -113dBm or less
1 -111dBm
2...30 -109dBm... -53dBm
31 -51dBm or greater
99 Not known or not detectable
100 -116dBm or less
101 -115dBm
102...190 -114dBm...-26dBm
191 -25dBm or greater
199 Not known or not detectable
100~199 Extended to be used in TD-SCDMA indicating received signal code power (RSCP)
<ber> Channel bit error rate (in percent)
0...7 As RXQUAL values in the table in 3GPP TS 45.008 subclause 8.2.4
99 Not known or not detectable
<rssi> 0
<rssi> 0