Device is not de-registered after disown / factory reset
OCF Device to Cloud Services specification requires that device which is disowned / hard-reseted shall be deregistered from the cloud. Section 8.6.1.
De-registration process is specified in the same spec, section 5.4.10.
Current behavior is that the device just closes the connection and is still present in the cloud.
After further investigation, problem is not that the device just closes the connection, but Sign-Off is called with missing device id query parameter.