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A Matter of Timing

The LMP_slot_offset message goes from the slave (at this stage, that's the LAN access point) to the master (at this stage, that's the device connecting to the LAN access point).

It carries the current slave's Bluetooth device address and the offset in timing between the current slave and the current master. This offset is calculated by taking the time that a transmit slot would start if the current slave (the LAN access point) was the master of the piconet, and subtracting the time when a transmit slot starts in the current piconet. This difference is shown in Figure 4.

Figure 4

Timing diagram for slot offset.

The slot offset allows the current master (the device that is connecting to the LAN access point) to work out the detailed timing of a piconet where the LAN access point is the master.

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