Consumer does not process message without Deliver options

follow issue https://github.com/nats-io/stan.net/issues/171

Currently I see it works well with this command:

.\StanSub -qgroup newgroup -clientid xyz -all

But when I remove -all/-seq/-last then it won’t process message It also does not process message when I add durable param like this

.\StanSub -qgroup groupA -clientid xyz -all -durable aaaa

In another hand, when I used param -last it just show the last message in streams, I thought it will process message from the last message that it processed before at the point consumer is stopped

And sometime with -durable it process the last message it stopped in the last times, but sometime it does not do anything

Added video for reproducing

issues-with-nats-client.zip

[ColinSullivan1]

For durables, the starting position given by the client when restarting a durable subscription is ignored… The 2nd run was restarting the durable. You’ll need to unsubscribe the durable with the -unsubscribe parameter to receive all messages again.

https://docs.nats.io/nats-streaming-concepts/channels/subscriptions/durable

[ColinSullivan1]

@minhhungit , The server will retain state of a subscriber until it recognizes that subscriber has been disconnected. If the subscriber is durable, it’ll retain that state, so the subscriber can be disconnected for any period of time and will resume where it left off until it is unsubscribed. Note that If the server has reached any of it’s limits and rolled messages off, then the subscriber may not receive all of the messages sent while it was down, but this is not a common case.

If you start a durable (or any) subscription without requesting any previously published messages (in the sample, -all, -seq, -since), that subscriber will only receive messages published after the point it has subscribed.