If you start up a Debian install straight from ubiboot, with TI's BTLE-patched BlueZ, I can advertise the N9 as a Low Energy device to the 4S.

I'd work on this a bit more, but while assembling a serial terminal card for the N9 (fun experiments involving a certain 3.5.3 kernel and Harmattan), my iron slipped, and burned two fingers. Then it turned out the solder joint was too tall to fit in the slot

I'll get back poking on this when my left hand can type comfortably again...

If anyone wants to try having some fun, pull the Aegis patch (then apply the Open Mode patch :P), and hack them into the N9 Kernel Update 3.5.3. Add back CONFIG_VMSPLIT_3G_OPT at arch/arm/Kconfig, then build the kernel and try starting Harmattan.

FYI: MSSF/Aegis is so problematic on 3.5.3, that I think it'd be better simply to stub Aegis functions.

If you still choose to patch in real Aegis bits (tm), note that DECLARE_MUTEX is now DEFINE_SEMAPHORE