Cellular modem - AT commands

Tachyon
1

Hi @mrlambchop,

Does Particle have a terminal shell command to execute AT commands, or will there be an AT client or a modem shell?

Is the command "particle-tachyon-ril-ctl" (currently no --help option) intended to substitute for the above? Thanks.

2

Yes!

I'll let Brett loop back here shortly with how it works. Thanks!

Cheers,

Nick

3

Thanks Nick.

I'm not familiar with the RILD (Radio Interface Layer Daemon) framework design that Tachyon uses.

I expect using RILD to run AT commands is a simple matter of ensuring that the daemon is active, accessing the correct device file, and using the terminal to send and receive the commands.

What "/dev" file does the modem use?

btw - It would be good to add the info to the docs.

4

@mrlambchop , How do I get hold of a Tachyon debugger board? Thanks.

5

Hi @BDub, How do I run AT commands using RILD? Thanks.

6

Here's how you run AT commands... however... be careful not to break things :smiley:

particle-tachyon-ril-ctl sendat <at_command>

# standard at/ok check
particle-tachyon-ril-ctl sendat at
OK

# check modem serial number
particle-tachyon-ril-ctl sendat at+qgmr
Quectel
QCM6490
Revision: SG560DNAPAR60A01_BP01.001_Linux5.4.86.01.001
OK

# check modem iccid
particle-tachyon-ril-ctl sendat at+iccid
ICCID: 8935123456789012345F
OK

# make sure to wrap use of double quotes in single quotes, or escape them
particle-tachyon-ril-ctl sendat 'at+cgdcont=1,"IP","my_apn"'
OK
particle-tachyon-ril-ctl sendat at+cgdcont=1,\"IP\",\"my_apn\"
OK

# Don't do this!
particle-tachyon-ril-ctl sendat at+cgdcont=1,"IP","my_apn"
ERROR
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7

@BDub, Cheers!

The command particle-tachyon-ril-ctl doesn't appear to support the "--help" option yet. Is one planned? Thanks.

8

Yes, that's somewhat intentional since the commands it supports are in flux.

Supported commands should be documented here:
Cellular Modem | Particle Developer

And here:
GNSS (GPS) | Particle Developer

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9

Thanks @BDub

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