https://learn.adafruit.com/using-the-rockblock-iridium-modem/hardware
Hardware | Using the RockBLOCK Iridium Modem | Adafruit Learning System
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https://learn.adafruit.com/using-the-rockblock-iridium-modem/basic-test
Basic Comms Check | Using the RockBLOCK Iridium Modem | Adafruit Learning System
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