This device below:
MQTT / SparkPlugB built in for any MQTT-ready host
https://signal-fire.com/lte-m1-cellular-products/ranger-node/
Specifies MQTT SparkPlugB so it should work very well with the Cirrus Links modules in Ignition right?
Yes, we do most of our testing and development against Ignition. 
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So this is one device which can read in some digital or analog data and transmit it all back to Ignition via MQTT over cellular?
Yes. The base unit supports two digital and one analog (4-20mA or 1-5V) input, as well as one digital output. The unit is battery powered and can also provide 13 or 18V to an external sensor if it’s power requirements aren’t too high. Batteries nominally last a couple years w/ a 5 minute report interval, although it can be more or less depending on the sensor power draw and if you have it report more or less often. Solar power is also possible.
We also have add-on options to let you control modbus, HART, or SDI12 sensors systems back over SparkplugB.
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Awesome. This is great to hear. We may be buying these in the future.