# MQTT message structure
## MSG Header
Every message. Total len 18 bytes.
```mermaid
block-beta
    T["<b>TIME</b><br>4 bytes<br>seconds"]:2
	Tm["<b>TIME</b><br>4 bytes<br>useconds"]:2
    MAC["WIFI MAC<br>6 bytes"]:3
    GRP["Group id<br>4 bytes"]:2
```
# Block messages

## Radar message
Arrives every 10 seconds. Total len 49 + 18 = 67 bytes
```mermaid
block-beta
    MSG_HEADER
    B["0x10"]
    C["14 uint16<br>motion energy"]
	D["10 uint16<br>stationary energy"]
```
<br>

## Sensors message
Arrives every 10 seconds, when gas sensor data has been collected. Total len: 18 + 16 + 5 * number_data_pairs
```mermaid
block-beta
    MSG_HEADER:1
    B["0x11"]:1
    C["Pressure<br>float"]:1
	D["Temperature<br>float"]:1
	E["light<br>2 bytes"]:1
	F["humidity<br>float"]:1
	G["Number of data pairs<br>byte"]:1
	block:aa:3
	H["index 1<br>byte"]
	I["gas resistance 1<br>float"]
	J["..."]
	end
```

<br>

# Notification messages

## Pressure
Total len: 18 + 5 = 23 bytes
```mermaid
block-beta
    MSG_HEADER
    B["0x01"]
    C["value<br>float"]
```

## Temperature
Total len: 18 + 5 = 23 bytes
```mermaid
block-beta
    MSG_HEADER
    B["0x02"]
    C["value<br>float"]
```

## Humidity
Total len: 18 + 5 = 23 bytes
```mermaid
block-beta
    MSG_HEADER
    B["0x03"]
    C["value<br>float"]
```

## Light
Total len: 18 + 3 = 21 bytes
```mermaid
block-beta
    MSG_HEADER
    B["0x04"]
    C["value<br>2 bytes"]
```