Our Service Capability Server (IMPACT) doesn’t have the information whether a downlink message arrived or not.
This feature will be available in our new CoAP adapter (to avoid confusion: this is the pure version of CoAP and not the Neul version that you are used to). We do not have it commecially available yet, but is already available for testing. (I believe testing is a good idea for the future batches of your use case anyway.)
In the meantime I also checked with other customers how they are dealing with getting such confirmations. When they do a firmware update, it also includes a new configuration.In this configuration, there is a piece of code that ensures that the device from now on sends a new version number with each uplink.
- A temperature sensor sends its temperature with version 1.0 every 4 hours in the same uplink.
- The sensor receives a firmware update
- From now on, the sensor always sends version 2.0 with each uplink, if not then the update was not succesfull
Hope this helps!