Datacake Downlink to Chirpstack V4

Setup and configuration
1

I am attempting to send a downlink from Datacake to CS V4. I have installed chirpstack-rest-api and configured a downlink in Datacake. I have Datacake configured to send the downlink to http://[IP of my CS Server]:8090. The data send from datacake looks like this:

{"deviceQueueItem": {"confirmed": false, "fPort": 1, "data": "AQAAeA=="}}

I get this response from CS:

{"code":3, "message":"Validation error: FPort must be between 1 - 255", "details":[]}

I would appear that the API is active and parsing the data but for some reason I thinks fport is <1. I assume there is a formatting error in the downlink but based on the V3 API it looks correct to me.

Any hints would be appreciated.

2

After further testing, this doesn’t seem to have anything to do with Datacake. I pulled the example from the V3 API documentation and ran it on my server with the same result. Here is the command that I used:

curl -X POST --header 'Content-Type: application/json' --header 'Accept: application/json' --header 'Grpc-Metadata-Authorization: Bearer [My Key]' -d '{"deviceQueueItem": {"confirmed": false, "data": "AQID","fPort": 100}}' 'http://localhost:8090/api/devices/A840411BB185E96B/queue'

Which returns this:

{"code":3, "message":"Validation error: FPort must be between 1 - 255", "details":[]}
3

Interestingly if I run the same command on a V3 server I get this:

{"error":"f_port must be \u003e 0","code":3,"message":"f_port must be \u003e 0","details":[]}
4

Anything further on this? I’m experiencing similar issues.