What have you used as a poller for Outbox?

A poller for Outbox often uses a periodic timer or a task scheduler that polls the Outbox table in the database at a certain interval for new messages. For example, in embedded systems or IoT devices, a simple delay loop can be used to read new entries and send them to the target system.

Example in pseudocode:

while (true) {
    List<OutboxMessage> messages = outboxRepository.fetchNewMessages();
    for (OutboxMessage msg : messages) {
        sendMessage(msg);
        outboxRepository.markAsSent(msg);
    }
    Thread.sleep(pollIntervalMillis);
}

This approach is simple and reliable, especially if there is no need for complex event systems or queues. In more complex systems, database triggers or notification mechanisms can be used, but for embedded/IoT, simple polling is often sufficient.