[Tinyos-devel] problem of using FTSP and CTP

[Philip Levis]

On Mar 23, 2009, at 10:34 AM, Miklos Maroti wrote:

> There is a separate issue: do we want to allow the EBUSY return code
> from the MAC layer? I always assumed that we should because there
> could be several conditions where sending is not possible temporarily
> (see my previous post). If we decide that it is NOT possible, then we
> need to audit/rework the radio drivers (at least the RF230 I guess).

I think returning EBUSY due to an internal condition is problematic:  
the caller won't know when to retry the call.

The radio stack should buffer the send instead. Otherwise we'll get  
into a situation where a sender needs to wire to every possible (and  
possibly hardware-dependent) split-phase interface, in order to retry  
on getting the corresponding completion event.

Phil