ChSel Algorithm

RE: ChSel Algorithm

Linus — Thu, 11 Oct 2018 11:03:56 GMT

Hi ,Petter. which SD can be changed now?

RE: ChSel Algorithm

Stayhungry — Sat, 25 Nov 2017 03:29:19 GMT

Thanks,petter.

RE: ChSel Algorithm

Petter Myhre — Thu, 23 Nov 2017 10:03:30 GMT

This cannot be changed, per spec the advertiser (peripheral) has to set ChSel to 1 if it supports LE Channel Selection Algorithm #2 (Bluetooth Core 5.0, Vol. 6, Part B, Section 2.3.1.1):

The ChSel field in the advertising channel PDU header shall be set to 1 if the advertiser supports the LE Channel Selection Algorithm #2 feature

And the initiatior (central) has to set ChSel to 1 if it supports LE Channel Selection Algorithm #2 (Bluetooth Core 5.0, Vol. 6, Part B, Section 2.3.3.1):

The ChSel field in the CONNECT_IND PDU header shall be set to 1 if the initiator supports the LE Channel Selection Algorithm #2 feature

If both support LE Channel Selection Algorithm #2 this should be used (Bluetooth Core 5.0, Vol. 6, Part B, Section 4.5):

If the initiator sent a CONNECT_IND PDU in response to an ADV_IND or ADV_DIRECT_IND PDU and either or both device’s PDU had the ChSel field set to 0, then Channel Selection Algorithm #1 (see Section 4.5.8.2) shall be used on the connection. Otherwise, Channel Selection Algorithm #2 (see Section 4.5.8.3) shall be used.

RE: ChSel Algorithm

Stayhungry — Thu, 23 Nov 2017 05:13:19 GMT

Or is it that I can not change # 2 to # 1?

RE: ChSel Algorithm

Stayhungry — Wed, 22 Nov 2017 16:27:10 GMT

I'm pretty sure both are # 2, because I saw this from wireshark, is there any way I can switch to # 1

RE: ChSel Algorithm

Petter Myhre — Wed, 22 Nov 2017 15:56:03 GMT

That could be. What is the ChSel field of the Advertising channel PDU Header of the advertising PDU and the CONNECT_IND PDU?