4G HAT notes

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I have several remote Wifi objects (Arduino Nano with ESP8266) that connect every 6-12 hours to the internet for data transmission. I would like to create a wireless access point for these objects to share a GPRS internet connection. These objects along with the wireless access point will be placed outdoor in the field to transmit data on a regular basis. I have a raspberry pi 3B+ and a SIM 800L Module with SIM card and IoT data plan. In the forum I see a lot of discussions on wireless access point to WLAN Router or Ethernet connection but nothing using a mobile (GSM/3G/4G) data connection. Can such a gateway be setup on a RPi? Since I am new to the RPi community your help and guidance would be appreciated. Br cwk

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    If the Pi has normal internet access via the GSM modem, then yes, you could use it as a wifi access point. – goldilocks yesterday
  • Thanks for the assurance. Could you please provide some guidance. First I will need to ensure GSM connection, for instance shown here instructables.com/id/Raspberry-Pi-With-a-GSM-Module Second I will install a WLAN accessPoint as for instance shown here raspberrypi.org/documentation/configuration/wireless/… I am wondering whether there will be conflicting serial port communication and do you know roadblocks that should be avoided. So your advise would be gratefully appreciated. Br cwk – cwk 22 hours ago
  • As far as I know there is no general setup to attach an USB/GSM dongle to the RasPi. You have to follow the instructions from the manufacturer. Maybe you have to use a ppp connection and control the GSM dongle with AT commands? Typically you will get an usb0 or ppp0 interface you can use for network setup. – Ingo 19 hours ago
  • Cwk, we aren’t really a “discussion style” site where people willy-nilly brainstorm under a broad umbrella. You would probably be better off asking separate, singular, specific questions about each objective task, rather than the whole project at once. – goldilocks 19 hours ago
  • Ah, what you need is a MiFi modem or 4G HAT. If you have not yet started your project, I would suggest to get MiFi modem or 4G HAT. I have both ZTE MF920V and WaveShare 4G HAT (with GPRS!) in hand. I am happy to mess around with you on it. References: (1) “SMS Gateway project using ZTE MF920V 4G MiFi Modem – Rpi.stackExchange”” raspberrypi.stackexchange.com/questions/107923/…, (2) “SIM7600 4G LET HAT – Rpi.Org”: raspberrypi.org/forums/…. Cheers. / to continue, … – tlfong01 5 hours ago
  • BTW. SIM7600 4G HAT (same for SIM800/900) native hand shaking language is serial AT commands. And you can use Rpi USB to UART cables/adapters in case you find the on board serial RxD/TxD not smooth. Moreover, Rpi4B buster has 5 hardware serial ports for you to mess around (SIM7600 actually needs multiple, separate serial ports for AT command, GPRS, and debugging etc.) – tlfong01 5 hours ago

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