Broker.start() and LinkRx.recv() never yield?

[thomas725]

I'm currently trying to debug hangups in my project and what both gdb stacktraces and tokio_console show me - there's something strange going on between tokio & my usage of rumqtt.

The tokio_console give's a clear WARNING: Both my tokio tasks running Broker.start() and LinkRx.recv() never yield back control. I'm using rumqtt 0.19.0 and tokio 1.45.1.

Can you help me debug this issue? Should I do something different? My mqtt code is fairly simple and has 90 lines: https://gitlab.com/thomas351/rust-influxdb-udp-logger/blob/a7f8fa4f7d495da48079a72d8584905b8b2be782/src/mqtt_relay.rs

[thomas725]

Okey so I think I understand a bit more about sync / async rust than yesterday.

The methods I'm using to start the mqtt broker and listen for notifications are sync rust, so by calling them I'm blocking the callers thread.

Does rumqtt have async versions of Broker.start() and or LinkRx.recv() I could use instead?

For now I've worked around my issues by using the tokio spawn_blocking function instead of spawn. See also: https://gitlab.com/thomas351/rust-influxdb-udp-logger/-/commit/de7cca1876ed5674e9eafa36fff92b459721534c