Hi rswl88,
1. This depends on their size, but from Peripheral to Central, the last notification will not have been acked on the link layer at the end of an interval, so it will take up space in the buffer. So, three max-size notifications can be sent each time.
2. No, because only one GATT subprocedure can take place at once. i.e. ones that need a response like Read/Write occupy one whole event.
3. Yes. For handleFailure, choose between (from peripheral.h)
#define GAPROLE_NO_ACTION 0 // Take no action upon unsuccessful parameter updates
#define GAPROLE_RESEND_PARAM_UPDATE 1 // Continue to resend request until successful update
#define GAPROLE_TERMINATE_LINK 2 // Terminate link upon unsuccessful parameter updates
Best regards,
Aslak