Table 1.
node sent to the base station data format.
| Name | Length (Byte) | Meaning |
|---|---|---|
| Message header | 1 | Regular byte 0XD7 |
| Serial number of nodes | 1 | The serial number of nodes (set by users) |
| Message numbering | 1 | It’s used to identify message currently delivered |
| CRC check code | 2 | Data CRC check code |
| Data length | 1 | Data length (excluding the first three items and its own length) |
| Sensor state | 1 | Whether the sensors are valid |
| Sensor data | N | The data of sensors are concerned about temperature, humidity and battery voltage |
| Sampling time | 6 | The time when data are sampled |