lorawan example for sending data to TTN

micropython/lorawan_example.py

@@ -0,0 +1,42 @@
+from lora_transceiver import LoRaTransceiver
+
+from uPySensors.ssd1306_i2c import Display
+
+import uLoRaWAN
+from uLoRaWAN.MHDR import MHDR
+
+d = Display()
+
+# create transceiver for LoRaWAN frequency (channel 0 = 868.1 Mhz)
+lora = LoRaTransceiver(frequency=868.1E6, syncword=0x34, display=d)
+
+# change the spreading factor
+lora.setSpreadingFactor(9)
+
+# set address and keys for LoRaWAN
+devAddr = [0x26, 0x01, 0x16, 0x5C] # ir_test_device_01
+#devAddr = [0x26, 0x01, 0x18, 0x52] # ir_test_device_02
+#devAddr = [0x26, 0x01, 0x1E, 0x4F] # ir_test_device_03
+
+nwkSKey = [0x9D, 0x95, 0x0F, 0xAB, 0xCB, 0x63, 0xD3, 0x04, 0xBC, 0x09, 0xC4, 0x9E, 0xC5, 0xDF, 0x3C, 0x37]
+appSKey = [0xC9, 0x6C, 0x00, 0xD1, 0xB0, 0x1C, 0x2E, 0x42, 0x11, 0xBA, 0x32, 0x6F, 0x2F, 0xC2, 0x75, 0x6A]
+
+devAddr_hex = " ".join(list(map(lambda x: "{0:02x}".format(x), devAddr))).upper()
+nwkSKey_hex = " ".join(list(map(lambda x: "{0:02x}".format(x), nwkSKey))).upper()
+appSKey_hex = " ".join(list(map(lambda x: "{0:02x}".format(x), appSKey))).upper()
+print("devAddr: ", devAddr_hex)
+print("nwkSKey: ", nwkSKey_hex)
+print("appSKey: ", appSKey_hex)
+
+# lorawan object for conversion of data in LoRaWAN message format
+lorawan = uLoRaWAN.new(nwkSKey, appSKey)
+
+def send_lorawan(message, frame_cnt=0):
+    lorawan.create(MHDR.UNCONF_DATA_UP, {'devaddr': devAddr, 'fcnt': frame_cnt, 'data': list(map(ord, message)) })
+    payload = lorawan.to_raw()
+
+    lora.send(payload)
+
+    print("lorawan message sent")
+
+send_lorawan("Hello world!")