Kapacitor Join is not working with Group clause

[DavidA]

I think I might have a similar problem here:

TICKscript: Calculate difference between two streams but join is failing

I’m just learning the basics at the moment. TICK seems like an excellent IoT back end and I’m hoping I can use it for many future projects. However in this specific instance, what I have is an embedded device as part of a heating system that is publishing two temperature values to two MQTT topics every 5 seconds via a mosquitto MQTT broker. “mydevice/sensor1” is the pre-heated temperature, and “mydevice/sensor2” is post-heating temperature. The values are published at almost the same time, so t…

The .groupBy(*) clause is causing the join() to fail and emit no items. If I remove the group (which I can do in this case) the join works as expected.