Unable to get clean data from RAK8212 connected to ESP8266 over Serial1

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Gordon
What you're doing sounds pretty much spot on, including baud rate.

In addition to what Robin says, things I can think are:
- You don't have GND connected together on everything
- You don't have a powerful enough 3.3v voltage source for the ESP8266 - I'm not sure but RAK8212 may not have a powerful voltage regulator
- RX/TX pin are swapped?

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