Hi Jonas,

> 
> Furthermore, there's not an AT command sent every 500 ms.  The command 
> gets requeued after 500ms, but it doesn't actually go out until the 
> modem responds to the first one... not quite sure why this works, to be 
> honest.
> 

Funny.  But not real confidence inspiring :)

Martin, any ideas what could be going wrong here?

Regards,
-Denis