LoPy LoRa range test - transmitter

node1.py

import socket
import time
import struct
from network import LoRa
import pycom
pycom.heartbeat(False)
pycom.rgbled(0x000fff) #blue
# A basic package header, B: 1 byte for the deviceId, B: 1 bytes for the pkg size
_LORA_PKG_FORMAT = "BB%ds"
_LORA_PKG_ACK_FORMAT = "BBB"
DEVICE_ID = 0x01

# Open a Lora Socket, use tx_iq to avoid listening to our own messages
lora = LoRa(mode=LoRa.LORA, tx_iq=True, tx_power=14, power_mode=LoRa.ALWAYS_ON, public=True, tx_retries=1)
lora_sock = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
lora_sock.setblocking(False)

colors = {"red":"0x7f0000", "orange": "0xff8000", "gold": "0xffbf00","yellow": "0x7f7f00",  "green": "0x007f00"} 
max_time_waiting=4 #periods
pause_time=300 #ms
while(True):
    try:
        # Package send containing a simple string
        for color in list(colors.values()):
            msg = color
            pkg = struct.pack(_LORA_PKG_FORMAT % len(msg), DEVICE_ID, len(msg), msg)
            lora_sock.send(pkg)
            waiting_ack = True
            time_waiting = max_time_waiting
            while(waiting_ack):
                time_waiting = time_waiting-1
                recv_ack = lora_sock.recv(256)
                if (len(recv_ack) > 0):
                    device_id, pkg_len, ack = struct.unpack(_LORA_PKG_ACK_FORMAT, recv_ack)
                    if (device_id == DEVICE_ID):
                        if (ack == 200):
                            waiting_ack = False
                            # If the uart = machine.UART(0, 115200) and os.dupterm(uart) are set in the boot.py this print should appear in the serial port
                            #print("ACK")
                            pycom.rgbled(int(msg))
                        else:
                            waiting_ack = False
                            # If the uart = machine.UART(0, 115200) and os.dupterm(uart) are set in the boot.py this print should appear in the serial port
                            print("Message Failed")
                            pycom.rgbled(0xffffff) #white
                else:
                    if(time_waiting <= 0):
                        waiting_ack = False
                        print("Message Lost")
                        pycom.rgbled(0x000fff) #blue
                    else:
                        time.sleep(pause_time/1000)
    except:
        print("Exception encountered")
        time.sleep(1)