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Why does Nordic_Uart sample do an illegal response for iPhone X?

Yoshihiro Goto

I am trying to communicate with iPhone X using Nordic_Uart sample project in SDK 14.2. And I check the Protocols between nRF52DK and iPhone X by using Ellisys Bluetooth Tracker, I found an error on LLCP Length Response. LL_LENGTH_RSP.png

The nRF52DK responses a value of 313 as both MaxTx and MaxRx for iPhone X. why does this incomprehensible thing occur?

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    @Yoshihiro Goto: could you try these things: 1. set a defined length when calling sd_ble_gap_data_length_update instead of NULL for dl_params. 2. setting PHY to 1mbit when calling sd_ble_gap_phy_update instead of setting it to Auto.

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    @Yoshihiro Goto: could you try these things: 1. set a defined length when calling sd_ble_gap_data_length_update instead of NULL for dl_params. 2. setting PHY to 1mbit when calling sd_ble_gap_phy_update instead of setting it to Auto.

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