Table 2.
Data and metadata transmitted between the air station and the ground one.
| Data | Device | Served by | MQTT Topic |
|---|---|---|---|
| concentration of gases | Waveshare MQ-135 | sensor service | UAV1/devonboard/airquality |
| current position | Waveshare SIM7000E | positioning service | UAV1/devonboard/position |
| current position | buffer | sensor service | as the accompanied data |
| humidity | Measurement HTU21D | sensor service | UAV1/devonboard/humidity |
| temperature | Measurement HTU21D | sensor service | UAV1/devonboard/temperature |
| time | system clock | sensor service | as the accompanied data |
| time | video card clock | WebRTC video service | not applicable |
| PM2.5 | Seeed Studio HM3301 | sensor service | UAV1/devonboard/PM |
| video frame | Manta MM9359FS | WebRTC video service | not applicable |