Customization in OTA flow between IOT device and IOT HUB service about iot-hub-device-update HOT 2 CLOSED

Yes, it should be straightforward to implement.

In the block of std::thread worker, before calling

Download(workflowId, updateType, info) {

it would first make call to your approval service as per its client/server protocol. For example, it could have long-lived keep-alive connection and block to wait for response, or poll over an interval of time and give up after max time (30 days)
, etc.

If the approval is denied, then download worker thread will need to set ADUC_Result result to an failure ResultCode and a reasonable ExtendedResultCode. e.g.

#define E_APPROVAL_DENIED <some 32-bit number>
{
    -1,
    E_APPROVAL_DENIED
} 

It needs to continue calling WorkCompletionCallback so that the state machine can continue it transition to the next state. e.g.

workCompletionData->WorkCompletionCallback(workCompletionData->WorkCompletionToken, result);

What this means for PP Agent is it will send the failure to the cloud for Download UpdateAction and it will show as failed and twin will have extended result code.
For PPR Agent, it will similarly show the entire deployment as failed and twin data will also contain the extended result code.

Exiting early and not transitioning to a final success/fail state and then to Idle will make backend not about device status. For PPR, it will show as in-progress indefinitely and there is no timeout for deployment. It is clearer to allow it to transition to final state so it will show success/failure in portal UX and service operator can see the reason (Approval was denied in this case).

If approved, it would just continue on with the Download() call (and also call WorkCompletionCallback with result of download).

from iot-hub-device-update.

@jw-msft
I have successfully changed the agent with above requirement and its working fine.
Basically i found out the place where code bypass to my customized block of code that do some action and once action fullfilled , i resume agent code by calling same function that should be called in normal flow.
function name is adu_handleaction().

from iot-hub-device-update.