[hono-dev] Command/Control - Adapter doesn't have credits on device comm

["Schmid Christian (INST/ECS4)" <christian.schmid3@xxxxxxxxxxxx>]

Hi Hono Devs,
 
I have a question regarding the command and control flow in edge situations:
 
With PR https://github.com/eclipse/hono/pull/898 a solution was introduced to solve the issue that a command was being sent by a CommandSender before the available credits were granted.
 
My question now: Can there be the same issue for the inversed message flow:
 
Given a device sends a command response to a protocol adapter.
Can it happen that the protocol adapter does not receive the necessary credits to further transmit the received command response to the business application? 
 
If this is the case:
- Will the device receive a proper response code?
- Would it be a good idea to defer the response to the device until the credits are granted?
  
Thanks
Chris