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After the Switch

Now that the LAN access point is truly the master, it sends poll packets until it gets an answering null from its new slave. The connection is properly established with the LAN access point in control as master, so it can finally send an LMP_accepted message in response to the LMP_host_connection_req that it got long ago before the role switch (see Figure 5).

Figure 5

Message sequence chart for master-slave switch.

The master-slave switch is finally completed, so both devices send an HCI role change event to their hosts to let them know what has happened to the connection.

If they want, both devices may go on to configure the link in other ways, such as setting up encryption, before they finally exchange the LMP_setup_complete messages to signal that they are happy with the state of the connection on their new piconet.

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Last Update: November 17, 2020