Make a log before calling callback

This might be useful to track down if the callback
might be delayed. Sometimes the test logs report a difference
of a few seconds between natlab receiving the event and telio
emitting it. This commit will allow to narrow it down.

Signed-off-by: Lukas Pukenis <[email protected]>

nat-lab/tests/test_events.py

@@ -186,7 +186,7 @@ async def test_event_content_meshnet(
 
         await client_alpha.set_meshnet_config(api.get_meshnet_config(alpha.id))
 
-        # Telio and NatLab both have a sampling rate of 1 second. 
+        # Telio and NatLab both have a sampling rate of 1 second.
         # As a result, in the worst case, an event could be delayed by up to 2 seconds.
         await client_alpha.wait_for_state_peer(
             beta.public_key, [NodeState.DISCONNECTED], [PathType.DIRECT], timeout=2

src/device.rs

@@ -520,7 +520,10 @@ impl Device {
             .name("libtelio-events".to_owned())
             .spawn(move || loop {
                 match event_rx.blocking_recv() {
-                    Ok(event) => event_cb(event),
+                    Ok(event) => {
+                        telio_log_debug!("EVENT: Just before event callback: {:?}", event);
+                        event_cb(event);
+                    }
                     Err(RecvError::Lagged(n)) => {
                         telio_log_warn!("Failed to receive new event, lagged: {n}")
                     }