LwM2M – C8Y should not implement queuing when a device registers with queue mode = false

For a LwM2M device, C8Y always performs queuing even if queue mode is set to false (Binding Mode: U) on registration. This can be observed by:

1. Device successfully registers.

2. A read (or write) is issued from the shell, but due to say a temporary loss of connectivity the read timeouts. Because of this timeout the device is considered “offline” by C8Y.

3. Any subsequent read is then queued and will only be completed after the next successful registration update which could be up to 24 hours later.

So could C8Y be modified so that:

If on registration a device’s queue mode is set to false (Binding Mode: U). It should be assumed that the device is always online, and C8Y should try the read/write/operation immediately. If the operation fails (after the configured retries), say due to a timeout, it should be marked as failed and no further action taken. In other words the read/write/operation should never be queued to try at a later time.

If on registration a device’s queue mode is set to true (Binding Mode: UQ). C8Y should operate as it does now i.e. it should be assumed that the device maybe online. C8Y should try the operation & if it times-out it should be queued, until the next time the device is online. It would be useful to also add the following:

1. Some configurable job timeout like 48 hours i.e. what happens if a device never comes back online.

2. Deduplication. No sense adding the same read/write/operation to the queue again if it’s already present.