emil,
I expect that it should work with PRI == NC_PRIORITY_HIGH. But, I don't think you should create the task with PRI == 1.
Typically, the NDK network task is set to run at OS_TASKPRINORM (defaults to 5), so I would recommend creating it at that priority. Furthermore, I would recommend that you *only* use the NDK's defined priority values (instead of hard numbers) when setting Task priorities (e.g. instead of "5" for a Task priority, use OS_TASKPRINORM).
Just in case you have not already seen it, discussions on this in the NDK User's Guide (spru523h.pdf), it can be found in your NDK installation:
3.1.2.3 Priorities for Tasks that Use NDK Functions
4.2.2 Scheduling Options
4.2.3 Scheduler Thread Priority
Steve