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net: lwm2m: send REGISTRATION_TIMEOUT event on error

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When socket errors call sm_handle_timeout_state() we might be
in a state where application assumes we are in registered state
but we are dropping it.
Therefore we must ensure that all registration states emit either
REGISTRATION_TIMEOUT event for application to indicate that
we have lost the connection to server.

Signed-off-by: Seppo Takalo <seppo.takalo@nordicsemi.no>
This commit is contained in:
Seppo Takalo 2024-08-01 14:09:38 +03:00 • committed by Anas Nashif
commit e7b06e1c86
3 changed files with 33 additions and 15 deletions
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9
doc/connectivity/networking/api/lwm2m.rst
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@ -579,7 +579,7 @@ The events are prefixed with ``LWM2M_RD_CLIENT_EVENT_``.
* - 4
- REGISTRATION_FAILURE
- Registration to LwM2M server failed.
Occurs if there is a failure in the registration.
Occurs if server rejects the registration attempt.
* - 5
- REGISTRATION_COMPLETE
- Registration to LwM2M server successful.
@ -587,8 +587,8 @@ The events are prefixed with ``LWM2M_RD_CLIENT_EVENT_``.
or when session resumption is used.
* - 6
- REG_TIMEOUT
- Registration or registration update timeout.
Occurs if there is a timeout during registration. Client have lost connection to the server.
- Registration status lost.
Occurs if there is socket errors or message timeouts. Client have lost connection to the server.
* - 7
- REG_UPDATE_COMPLETE
- Registration update completed.
@ -641,7 +641,8 @@ where it cannot recover.
* - BOOTSTRAP_TRANSFER_COMPLETE
- No actions needed
* - REGISTRATION_FAILURE
- No actions needed
- No actions needed.
Client proceeds re-registration automatically. Might need a bootstrap or configuration fix. Cannot send or receive data.
* - REGISTRATION_COMPLETE
- No actions needed.
Application can send or receive data.