Actual range of bonding handle

10/294/2019 | 04:28 AM

Hi,

I am writing a firmware for BGM121 which deals multiple bondings. Bluetooth Software API Reference Manual says that the number of bondings are limited to 14, but its bonding handle ranges from 0 to 31. I want to know whether the bonding handle can be really that big or it cannot be more than 14 or the max_bonding_count set by the sm_store_bonding_configuration command.

Answered

tmonte

Employee

Replied Oct 21 2019, 7:30 AM

Yes, in total the stack supports up to 32 bondings. The limit of 14 comes from the persistent store (please check QSG139 section 2.1).

1
Naoki Hamada

Replied Oct 21 2019, 8:16 AM

Thank you for clarifying the situation, tmonte! If the limit is set to default 14, the value of bonding handle remains under 14?

0
tmonte

Employee

Replied Oct 21 2019, 8:24 AM

Not necessarily, 14 is just a limit of how many simultaneous bonds you will have, it doesn't mean that the handle itself doesn't go over 14. But why is this a problem for your application? The handle is provided by the stack events, you don't need to worry about it.

Correct Answer

0
Naoki Hamada

Replied Oct 21 2019, 8:47 AM

If the value of bonding handle was guaranteed to be limited to 14, I needed only 4 bits to send it and it would fit so nicely into my protocol. Now I realized that the life is not that easy, as always! B-)

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Actual range of bonding handle