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docs:guide-user:network:wan:wwan:at_commands [2023/09/30 12:38] – [socat] andrewzdocs:guide-user:network:wan:wwan:at_commands [2024/03/22 01:05] – [echo] andrewz
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 A better solution is using a proper terminal application like ''picocom'', which can both send commands and print the modem's answers. There are other alternatives available like ''socat''. A better solution is using a proper terminal application like ''picocom'', which can both send commands and print the modem's answers. There are other alternatives available like ''socat''.
  
-Once the appropriate //serial// driver is loaded, the modem will expose a number of ''/dev/ttyUSBx'' interfaces.+Once the appropriate //serial// driver is loaded (typically - ''kmod-usb-serial-option''), the modem will expose a number of ''/dev/ttyUSBx'' interfaces. Usually only one or two of them will respond to AT commands.
  
 As an example, popular Quectel EP06 LTE modem will create 4 serial devices, ''/dev/ttyUSB0'' through to ''/dev/ttyUSB3''. As an example, popular Quectel EP06 LTE modem will create 4 serial devices, ''/dev/ttyUSB0'' through to ''/dev/ttyUSB3''.
 +
 +To find the serial devices added to the system, try looking through ''logread'' and/or ''dmesg'' output. Something like the following may help:
 +<code>
 +dmesg | grep -A 1 -B 12 ttyUSB
 +</code>
 +
 +For some modems ''ttyACM'' devices will be created instead of ''ttyUSB''.
 +
 +==== picocom ====
 +
 +''picocom'' is a simple terminal program that is installed in a standard way with ''opkg install picocom'' or through the web interface.
 +
 +Sample command line:
 +<code>
 +picocom /dev/ttyUSB2
 +</code>
 +Adding ''--q'' on the command line will suppress extra output with some help and other information.
 +
 +
 ==== socat ==== ==== socat ====
  
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 ==== echo ==== ==== echo ====
  
-Use ''echo -e'' so as to be able to escape characters such as ''"''.+See examples below. ''echo -e'' is used to send //escaped// characters such as quotation marks. 
 + 
 +Alternative solution - use ''echo'' with ''socat'': ''echo -e ATI | socat - /dev/ttyUSB2,crnl''
  
 ===== From a computer ===== ===== From a computer =====
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 ===== Examples of AT commands ===== ===== Examples of AT commands =====
  
-To test things are working, you can issue ''ATI'' which should return basic information such as brand, model and firmware revision.+To test things are working, you can issue a standard ''ATI'' command which should return basic information such as brand, model and firmware revision. 
 + 
 +''AT+CSQ'' can be used to get signal strength. The values returned are the RSSI (received signal strength indication, higher is better) and BER (bit error rate, lower is better)
  
-''AT+CSQ'' can be used to get signal strength. The values returned are the RSSI (received signal strength indication,higher is better) and BER (bit error rate, lower is better) 
  
-Here is example for the Huawei E392 LTE/3G dongle:+===== Huawei E392 =====
  
 <code> <code>
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 If the drivers are installed, they will see the modem and issue a special command to switch to a "working" configuration - this is 2,7 interfaces in this example. If the drivers are installed, they will see the modem and issue a special command to switch to a "working" configuration - this is 2,7 interfaces in this example.
  
-:!: **Warning: Never turn Off PC interface! (2:PCUI in this example)** You will lose the ability to access modem with terminal and change the configuration.+:!: **Warning: Never turn Off the AT Command interface! ("PCUIin Huawei terms)** You will lose the ability to access modem with terminal and change the configuration.
  
 You can add more interfaces to be active i.e. SD card: You can add more interfaces to be active i.e. SD card:
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 If you get an **ERROR**, maybe the numerical mode is not sorted (16,2,7)->(2,7,16). If your device answers to set command with **OK** but ''AT^SETPORT?'' doesn't show your desired settings, you can try using space in between numerical modes(2,7) and alphabetical modes(A2) like so: If you get an **ERROR**, maybe the numerical mode is not sorted (16,2,7)->(2,7,16). If your device answers to set command with **OK** but ''AT^SETPORT?'' doesn't show your desired settings, you can try using space in between numerical modes(2,7) and alphabetical modes(A2) like so:
 <code> <code>
-AT^SETPORT="A1,A2;2,7, A2"+AT^SETPORT="A1,A2;2,7,A2"
 </code> </code>
  
 Or with multiple modes: Or with multiple modes:
 <code> <code>
-AT^SETPORT="A1,A2;2,7, A1,A2"+AT^SETPORT="A1,A2;2,7,A1,A2"
 </code> </code>
  
-===== How to force LTE connection =====+===== Quectel modems =====
  
-Using telnet / SSH command line.+==== How to force LTE connection ====
  
 **Format:** **Format:**
 <code> <code>
-AT+QCFG=nwscanmode[,<scanmode>[,<effect>]]+AT+QCFG="nwscanmode"[,<scanmode>[,<effect>]]
 </code> </code>
  
  • Last modified: 2024/11/10 11:22
  • by andrewz