Question 1: Do you notice data is not coming into Cobundu during an installation?
Did you follow the instructions on Installation & Quality Assurance (https://confluence.mcs.be/display/SUM/Quality+Assurance) ?
Question 3: At which stage is the data missing? (more detailed info see below)
Sensor Connectivity (which steps to perform when a sensor seems to be down) has been presented during the Cobundu Summer 2021 Sessions, this is the recording: Summer 2021 Session: Sensor Connectivity
All tracknet/tabs now (since May 2021) connect to TTN
All Pointgrab sensors are connected to CPMS platform.
All Airthings sensors are connected to Airthings platform.
A sensor that sends joining messages is trying to join our LoRa network. Due to the way that LoRa works it can take quiet a few tries before everything is synchronized.
If however the sensor is still sending joining messages after 1 day it is best to reset the sensor by removing the battery for a couple of hours and reinserting it.
If you're interested in knowing the battery health for Tracknet tabs, you can check this page: Battery Lifecycle Measurement (Check Payload)