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Welcome, Guest. Please login or register. Thu May 23, 2024 04:14
SMSTools3 Community » Sample scripts / setups Bottom

Success report - Multitech MTCM2-L4G1D-B03-KIT

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Author Post
Jan 2023
Location: Cincinnati, OH, United States of America
Just got one of these little units:

It's a Quectel EG25-G under the hood:

It's the "global" model, seems to support just about everything carrier/frequency-wise. I'm using it on Verizon in the USA.

115200 by default, manifests as 4 USB serials (and a wwan network interface). I'm running off ttyUSB2 (both ttyUSB2/3 seem to work for smstools).

Here's a few lines from my modem config pertinent to this setup:

I think it might be a Verizon thing, but even when it's registered smstools thinks it's not registered (not smstools fault, the CGREG commands report funky status). Similar issue with the BER.

The more interesting / specific thing - is that Quectel has some kind of "lightweight m2m" protocol/server software etc. I.e. for sensor type networks. This is on by default and you will get occasional "error" messages about this not being set up, not bootstrapping etc. The init line in my config disables the m2m stuff to make the modem much more quiet.

Also (possibly another Verizon thing...) - I had to set:

I could send manually in text mode all day long. PDU mode was giving me fits. Seemed like if I sent to +1AAAPPPSSSS (US/Canada format) the messages went into a blackhole. Setting the national_prefixes got me sending in PDU mode finally.

Not endorsing this product per say, it's just what I bought and had success with. Hopefully this information will help anyone else who might be interested in this or a similar model.

Jan 2023
Location: Cincinnati, OH, United States of America
Topic owner
Small followup - I played around a bit more trying to get things happy with international format, etc. I ended up removing the national_prefixes line and instead in all my messages (I'm writing these out with Python) I add the header:

Once I did this, it seems like I can send nearly any format and it's happy. I even send some test international SMSes and they went right through.

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