Lora Testing Script via pyserial

lora_testing.py

import serial
import threading
import time

# Configure the serial port. 
# Replace '/dev/ttyUSB0' with your actual port:
# Windows: 'COM3', 'COM4', etc.
# Mac/Linux: '/dev/ttyUSB0', '/dev/ttyAMA0', etc.
SERIAL_PORT = '/dev/ttyUSB4' 
BAUD_RATE = 115200

try:
    ser = serial.Serial(
        port=SERIAL_PORT,
        baudrate=BAUD_RATE,
        bytesize=serial.EIGHTBITS,
        parity=serial.PARITY_NONE,
        stopbits=serial.STOPBITS_ONE,
        timeout=1.0
    )
except Exception as e:
    print(f"Error opening serial port: {e}")
    exit()

def read_from_port(serial_connection):
    """Continuously listens for incoming data from the RYLR998 module."""
    print("Listening for incoming LoRa messages...")
    while True:
        if serial_connection.in_waiting > 0:
            try:
                # Read the data until a newline character is found
                incoming_data = serial_connection.readline().decode('utf-8').strip()
                if incoming_data:
                    print(f"\n[Received]: {incoming_data}")
                    
                    # Incoming message format is usually: +RCV=ADDRESS,LENGTH,DATA,RSSI,SNR
                    if "+RCV=" in incoming_data:
                        print("-> Parsed Data Packet Received!")
            except Exception as e:
                print(f"Error reading serial: {e}")
        time.sleep(0.01)

# Start a background daemon thread to handle receiving data concurrently
listener_thread = threading.Thread(target=read_from_port, args=(ser,))
listener_thread.daemon = True
listener_thread.start()

def send_command(command_str):
    """Formats and sends an AT command to the module."""
    full_command = f"{command_str}\r\n"
    ser.write(full_command.encode('utf-8'))
    print(f"[Sent]: {command_str}")

# Basic initialization sequence
time.sleep(1) 
send_command("AT") # Test if the module responds with "+OK"

# Interactive Loop
try:
    while True:
        print("\n--- RYLR998 Control Menu ---")
        print("1. Send a Test (AT)")
        print("2. Send Text Message to another module")
        print("3. Custom AT Command")
        print("4. Exit")
        
        choice = input("Select an option: ")
        
        if choice == '1':
            send_command("AT")
        elif choice == '2':
            target_addr = input("Enter target module Address (e.g., 0, 1, 2): ")
            message = input("Enter your text message: ")
            length = len(message)
            # Format: AT+SEND=ADDRESS,LENGTH,DATA
            send_command(f"AT+SEND={target_addr},{length},{message}")
        elif choice == '3':
            custom_cmd = input("Enter full AT command (e.g., AT+ADDRESS?): ")
            send_command(custom_cmd)
        elif choice == '4':
            print("Exiting...")
            break
        else:
            print("Invalid choice.")
            
        time.sleep(2) # Give the background thread time to print the response

except KeyboardInterrupt:
    print("\nProgram interrupted by user.")
finally:
    ser.close()
    print("Serial port closed.")