Sorry to hear you will be shutting down your Exosite account. Let us know if we can help with some other path.
On to answer your question though.
When your device is talking to our Device API (assuming HTTP for now since not specified), you are going to get
204 responses as you are writing values to a resource.
> POST /onep:v1/stack/alias HTTP/1.1
> Host: <IOTCONNECTOR_ID>.m2.exosite.io
> Content-Type: application/x-www-form-urlencoded
> X-Exosite-CIK: <TOKEN>
> Accept: */*
> Content-Length: 89
Typical Response on successful write to a resource
< HTTP/1.1 204 No Content
< date: Tue, 17 May 2022 15:27:19 GMT
< server: Murano
If you were to delete that IoT Connector, your device clients will begin to get SSL handshake errors - there is no HTTP response.
If you tested with a cURL command from a shell for example:
curl --request POST \
--url https://<IOTCONNECTOR_ID>.m2.exosite.io/onep:v1/stack/alias \
--header 'Content-Type: application/x-www-form-urlencoded' \
--header 'X-Exosite-CIK: <TOKEN>' \
curl: (35) error:1404B410:SSL routines:ST_CONNECT:sslv3 alert handshake failure
Each device client will handle this slightly differently depending on the libraries / code language.