Does loraserial work with the qwic cable I’m trying to connect two RTK postcards but they do not seem to light up like they do with USB.
Unfortunately no, I2C on the Postcard is a future development that we have not tacked yet.
It looks like I can use a jst 6 to jst 4 cable in meantime? Also one of my loraserials shows a red light when hooked up and one does not. I am using putty with 57600 baud and I can’t seem to pass messages. I have updated to last RC on each of them and linked them as 1 server and 1 client.
You can 
Are the radios in point-to-point mode? Are you using 2 terminals/PCs? What are the LEDs doing on the radios? LED States - SparkFun LoRaSerial Product Manual
I have 1 that shows red and green and 1 that just shows the green across the top.
I got it working I think one of my Lora serials came with a burnt out power LeD 
but it is passing data now.
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