Ostinato API - Wait for stream transmission to finish

The Ostinato API tutorial configures a single stream to send 5 packets then sleeps for 7 seconds - assuming transmission would have finished by then - before fetching the tx/rx stats for verification.

This is fine for a tutorial, but for production scenarios you will want to wait till the transmission is finished instead of waiting (sleeping) for a specified amount of time.

Here’s how you can do that -

# wait for transmit to finish
while True:
    try:
        time.sleep(5)
        tx_stats = drone.getStats(tx_port)
        if tx_stats.port_stats[0].state.is_transmit_on == False:
            break
    except KeyboardInterrupt:
        log.info('transmit interrupted by user')
        break

Alternately, for recent Ostinato versions (2.0 onwards), you can use the waitForTransmitFinish() convenience API.

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