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LTE 4G SMS notes

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I have purchased this 4G HAT and I’m using it with this module in a raspberry 4. I use the USB connection.

I installed a ppp connection and everything is working correctly. My problem is: how do I send AT commands? I want to test several things, such as send sms or put the module in sleep mode.

I tried solutions like the ones shown here. However I don’t know which device I should choose (in the example ttyACM0) and I tried a few but it gives the error:

serial.serialutil.SerialException: [Errno 16] could not open port /dev/ttyUSB3: [Errno 16] Device or resource busy: '/dev/ttyUSB3'
  • Hello @Miguel, Welcome and nice to meet you. Ah, let me see. So you are using a very new 4G HAT, sitting on a PCIe module. But the tutorial you are following is very old, 10 years ago (2010jan10). Does SixFab recommend any more up dated tutorial? If not, I might skim you old tutorial and see If I can try to help. To confirm, I am reading the following references: (1) Raspberry Pi 3G/4G&LTE Base HAT – SixFab US$39 sixfab.com/product/…, / to continue, … – tlfong01 59 mins ago    
  • (2) Quectel EC25 Mini PCle 4G/LTE Module (Must use Rpi HAT) – SixFab US$54 sixfab.com/product/quectel-ec25-mini-pcle-4glte-module (3) How to Send/Receive SMS using AT commands? – StkOvflw 2010jan10 Viewed 41k times stackoverflow.com/questions/2161197/…, / to continue, … – tlfong01 59 mins ago   
  • I skimmed the SixFab docs and found that the toy you are playing is sort of “MiFi”. I made a quick a dirty summary for my future reference. You comment welcome: “SixFab 3G/4G/LTE (QMI and PPP), miniPCIe, USB/UART AT Commands (Rpi GPIO controlled RI/DTR) HAT/Module”: A LTE modem/dongle, for Rpi video streaming or high-speed data transferring, remote controllable LTE Wi-Fi Hotspot, high-speed GPS tracking, / to continue, … – tlfong01 33 mins ago   
  • My PCIe experience is mostly with the evil WinTel PC. Now let me compare and contrast the old PCIe I know with the new miniPCIe. I am looking at the UART related pins: (1) SixFeb miniPCIe module pinout: imgur.com/gallery/OcVeIwH, / to continue, … – tlfong01 29 mins ago   
  • You question title is a bit to vague. You 4G module can do a lot things, but I would suggest to narrow down to text SMS, forget voice etc, and also focus on LTE, forget GMS etc. So if you agree, I can edit the title for you, to make it more specific, to something like this: “How can Rpi4B python use USB/UART/Serial AT commands to control a 4G/LTE module to text SMS?” You comments and counter suggestions welcome. Ah, lunch time, I need to go. See you later. Cheers. – tlfong01 just now   Edit   Delete

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