User's Manual

Enhanced Class 1 Bluetooth v2.1 Module
User’s Guide
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CONN-GUIDE-BT740_v0.2
Figure 8-9: Display Only sequence diagram
The first EVT_SIMPLE_PAIRING contains the passcode which must be displayed. When the peer
confirms the passcode or otherwise, a second EVT_SIMPLE_PAIRING is sent to the host with an
appropriate success/fail code.
If pairing is successful, EVT_LINK_KEY is sent to the host; if not RSP_PAIR_INITIATE indicates a non-ok
status code.
8.15.1.2 Simple Secure Pairing ‘Keyboard Only’
The message sequence diagram for when the device has keyboard only capability is as follows:
Figure 8-10: Keyboard Only sequence diagram
The first EVT_SIMPLE_PAIRING indicates that a simple pairing procedure has started; at that point the
host responds with a confirm packet which contains the passcode that was visually obtained from the
peer device (or both peers decided to use the same code). When the peer confirms the pairing a second
EVT_SIMPLE_PAIRING is sent to the host with an appropriate success/fail code.
If pairing is successful, EVT_LINK_KEY is sent to the host; if not, RSP_PAIR_INITIATE indicates a non-
ok status code.
8.15.2 Incoming Pairing Procedure
As long as the module is in connectable mode (see CMD_CONNECTABLE_MODE) it can accept pairing
from peers.