lorawan: add initial LoRaWAN stack support

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

lora/lorawan/bytes.go

@@ -0,0 +1,37 @@
+package lorawan
+
+// revertByteArray inverts de order of a given byte slice
+func revertByteArray(s []byte) []byte {
+	for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
+		s[i], s[j] = s[j], s[i]
+	}
+	return s
+}
+
+// byteToHex return string hex representation of byte
+func byteToHex(b byte) string {
+	bb := (b >> 4) & 0x0F
+	ret := ""
+	if bb < 10 {
+		ret += string(rune('0' + bb))
+	} else {
+		ret += string(rune('A' + (bb - 10)))
+	}
+
+	bb = (b) & 0xF
+	if bb < 10 {
+		ret += string(rune('0' + bb))
+	} else {
+		ret += string(rune('A' + (bb - 10)))
+	}
+	return ret
+}
+
+// BytesToHexString converts byte slice to hex string representation
+func bytesToHexString(data []byte) string {
+	s := ""
+	for i := 0; i < len(data); i++ {
+		s += byteToHex(data[i])
+	}
+	return s
+}