examples: further work on at-lora

Signed-off-by: deadprogram <ron@hybridgroup.com>

examples/lora/atcmd/radio.go

@@ -0,0 +1,13 @@
+package main
+
+type LoraRadio interface {
+	Reset() error
+	LoraTx(pkt []uint8, timeoutMs uint32) error
+	LoraRx(timeoutMs uint32) ([]uint8, error)
+	SetLoraFrequency(freq uint32)
+	SetLoraIqMode(mode uint8)
+	SetLoraCodingRate(cr uint8)
+	SetLoraBandwidth(bw uint8)
+	SetLoraCrc(enable bool)
+	SetLoraSpreadingFactor(sf uint8)
+}