"Failed to save" error with esp thing

Mozilla IoT
#1

I’m very new to Mozilla Iot, I have setup a gateway on a pi 3 and have been playing around with making a ‘thing’ with a esp8266. my problem is that when adding the esp to the gateway it gives the error “Failed to save”.
this error only happens sometimes, mostly when I update the code on the esp, and I remove and re-add the esp to the gateway. When I manually go to the esp address (e.g. http://10.0.0.51/things/led ) I get valid json data.

also the gateway can’t auto find the esp (I have to manually add the url) I’m not sure if that is part of the problem.

#2

I’m not sure what could be happening since we swapped to dynamic json buffers. I’m planning to migrate to ArduinoJson 6 which might help. If you can connect to the ESP8266 over serial during the add thing process it might be able to print out some additional debugging information