Experiment with GPRS
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This article documents attempts to connect a Raspberry Pi to an MQTT server through a GPRS Modem.
We have selected initially the Waveshare GPRS Hat... https://www.robotshop.com/en/gsm-gprsgnssbluetooth-hat-raspberry-pi.html
This is a low cost modem (around £25) that should be capable of functions required.
Documents: