LoRa私有协议对接ChirpStack全解析的python实现

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#python #开发语言

LoRa私有协议对接ChirpStack的Python实现

以下为基于ChirpStack的LoRa私有协议对接实现，涵盖关键收发函数。假设使用ChirpStack的MQTT集成方式，并通过Python的paho-mqtt库实现通信。

环境准备

安装依赖库：

pip install paho-mqtt pycryptodome

MQTT连接配置

import paho.mqtt.client as mqtt
import json
from Crypto.Cipher import AES
from binascii import hexlify, unhexlify

# MQTT配置
MQTT_BROKER = "your_chirpstack_server"
MQTT_PORT = 1883
MQTT_USER = "your_username"
MQTT_PASS = "your_password"
TOPIC_UP = "application/+/device/+/up"
TOPIC_DOWN = "application/+/device/+/down"

数据加密解密

私有协议通常需要自定义加解密：

# AES加密配置（示例）
KEY = b'your_16bytes_key'
IV = b'your_16bytes_iv'

def encrypt_data(data):
    cipher = AES.new(KEY, AES.MODE_CBC, IV)
    padded_data = data + (16 - len(data) % 16) * chr(16 - len(data) % 16)
    return hexlify(cipher.encrypt(padded_data.encode())).decode()

def decrypt_data(encrypted):
    cipher = AES.new(KEY, AES.MODE_CBC, IV)
    decrypted = cipher.decrypt(unhexlify(encrypted))
    return decrypted[:-decrypted[-1]].decode()

上行数据接收

def on_connect(client, userdata, flags, rc):
    client.subscribe(TOPIC_UP)

def on_message(client, userdata, msg):
    try:
        payload = json.loads(msg.payload.decode())
        dev_eui = payload["deviceInfo"]["devEui"]
        raw_data = payload["data"]
        
        # 解密处理
        decrypted = decrypt_data(raw_data)
        print(f"Received from {dev_eui}: {decrypted}")
        
        # 业务逻辑处理
        process_uplink(decrypted)
        
    except Exception as e:
        print(f"Error processing uplink: {str(e)}")

def process_uplink(data):
    # 自定义上行数据处理逻辑
    pass

下行数据发送

def send_downlink(dev_eui, payload):
    try:
        # 加密处理
        encrypted = encrypt_data(payload)
        
        downlink_msg = {
            "confirmed": False,
            "fPort": 1,  # 自定义端口号
            "data": encrypted
        }
        
        topic = f"application/{dev_eui[:8]}/device/{dev_eui}/down"
        client.publish(topic, json.dumps(downlink_msg))
        print(f"Sent to {dev_eui}: {payload}")
        
    except Exception as e:
        print(f"Error sending downlink: {str(e)}")

主程序流程

client = mqtt.Client()
client.username_pw_set(MQTT_USER, MQTT_PASS)
client.on_connect = on_connect
client.on_message = on_message

client.connect(MQTT_BROKER, MQTT_PORT, 60)
client.loop_forever()