When the reporting interval arrives, but we couldn’t receive corresponding uplink packet in the Milesight IoT Cloud, that’s means uplink packet lost partly or totally, please refer to this guide to check.
Tip 1. Check whether the gateway is online in Milesight IoT Cloud. When the only one network connection of gateway down, the uplink packet will stop to transfer data packet to Milesight IoT Cloud. To avoid this situation, please configure gateway network link failover.
Tip 2. Check the battery of sensor is good or not, this issue occurs when battery is running out soon.
Tip 3. Check whether there is sensor data by itself using Toolbox.
Attach the smart phone with NFC support to read the sensor data by NFC, or through USB. If there is no measured data, then we should check more on hardware connection between the sensor probe and the base. If hardware connection is good. Try to reset the sensor to factory defaults then check it again.
If still no data measured, contact Milesight support for a deeper check.
If there is data, continue.
Tip 4. Check the frequency plan to see if it’s partly matched. For example, the gateway’s channels . are 903.9-905.3 MHz, but the sensor’s channels’ frequency are 902.3-904.5 Mhz. if the sensor send the data in 902.3 MHz this time, then it’s lost. But next time, it’s using 903.9 MHz, then it works.
Tip 5. Check the signal quality. If the RSSI is close to -110dBm, SNR is less than -3dB, it means the signal is too weak. We should optimize it. check this part to get the article How to Improve the LoRa Signal.
Tip 6. Milesight LoRaWAN Node supports re-transmit the data when there is no ACK confirmed by the gateway after the uplink. To enable this mode by the Confirmed Mode setting via toolbox. The sensor will re-transmit 3 times when the uplink is lost in the air.