نحن نعمل مع جهاز استشعار CO₂ Xiaomi ClearGrass Air Detector محليًا ، بدون خوادم صينية

1. CO₂
2. tVOC (المركبات العضوية المتطايرة)
3. PM2.5
4. درجة الحرارة
5. رطوبة

1. دراسة حركة المرور

sudo tcpdump -i wlan0 -vv -s0 -X -n port 1883 -s 65535 -w cleargrass.pcap

2. نلف حركة المرور من ClearGrass على Raspberry Pi

sudo iptables -i wlan0 -t nat -A PREROUTING -s 192.168.115.19 -j REDIRECT

3. MQTT nano-broker على JS لأتمتة المنزل Z-Way

MQTT PROTOCOL

Connect Command (sensor -> broker)
	0x10 - Connect Command

Connect Ack (broker -> sensor)
	0x20 - Connect Ack
	0x02 - Len 2
	0x00
	0x00 - Connection Accepted

Subscribe Request (sensor -> broker)
	0x82 - 0b1000 0010; 0b1000 - Subscribe Request

Subscribe Ack (broker -> sensor)
	0x90 - 0b1001 0000; 0b1001 - Subscribe Ack
	0x03 - Len 3
	0x00
	0x08 - Message identifier 8
	0x00 - Fire and Forget

Ping Request (sensor -> broker)
	0xC0 - Ping Request
	0x00 - Len 0

Ping Response (broker -> sensor)
	0xD0 - Ping Response
	0x00 - Len 0

Publish Message (sensor -> broker)
	0x30 - Publish Message
	0x96
	0x04 - Len 534

mqttSocket.reusable();
mqttSocket.bind(1883);
mqttSocket.onrecv = function(data, host, port) {
	var arr = new Uint8Array(data);

	switch(arr[0]) {
		// PING
		case 0xC0:
			console.log("---------- MQTT PING RESPONSE");
			this.send([0xD0, 0x00]);
			break;
		// CONNECT
		case 0x10:
			console.log("---------- MQTT CONNECT ACK");
			this.send([0x20, 0x02, 0x00, 0x00]);
			break;
		// SUBSCRIBE
		case 0x82:
			console.log("---------- MQTT SUBSCRIBE ACK");
			this.send([0x90, 0x03, arr[2], arr[3], 0x00]);
			break;
		// PUBLISH
		case 0x30:
			var sensorPayload = self.getPayload(arr);
			var sensorMessage = sensorPayload.substr(sensorPayload.indexOf('{'), sensorPayload.lastIndexOf('}'));
			var sensorObj = JSON.parse(sensorMessage);
			console.logJS("---------- MQTT MESSAGE:", sensorObj);
			console.logJS("---------- CO2: ", sensorObj.data.co2);
			self.vDevCO2.set("metrics:level", sensorObj.data.co2);
			break;
	}
};
mqttSocket.listen();