Dale, I’m not familiar at all with the Semtech SX1272MB2DAS Shield LoRa radio module.
I am, however, quite familiar with the MultiTech mDotTM LoRa radio modules, which come with an XBee interface that plugs right into the Mayfly and works without any trouble. My colleagues at LimnoTech’s Ann Arbor office have been using them successfully in the field for over a year, and I’ve started working with them myself in the last month. I’m hoping to share a full integration with the EnviroDIY ModularSensors library in the next month or two.
BTW, if you are not yet using ModularSensors, I strongly encourage you to do so. You can learn how to use it by following our Learn EnviroDIY Programming tutorial at https://github.com/EnviroDIY/LearnEnviroDIY.