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I get soft reset when MTU is bigger than 65

Stefan

Hello!

I am trying to increase the MTU size to get higher speeds. When I increase the MTU above 65 the application locks/software reset when doing transfer. Up to 65 it works. I have increased RAM memory for SoftDevice a lot. No difference. I check the return value of softdevice_enable(). Always zero. I have not enabled DLE.

65 sounds awfully close to 64, but it is still a bit strange value.

Any hints or tips would be appreciated

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    Are you handling the event BLE_GATTC_EVT_EXCHANGE_MTU_RSP ? and starting the ATT_MTU exhange with sd_ble_gattc_exchange_mtu_request() ? Take a look at the S132 v.3.0.0 migration document. "Configurable ATT_MTU" section contains information you need.

    You can also find an example on how to enable DLE and increase ATT_MTU for SDK 12 in this post.

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    Are you handling the event BLE_GATTC_EVT_EXCHANGE_MTU_RSP ? and starting the ATT_MTU exhange with sd_ble_gattc_exchange_mtu_request() ? Take a look at the S132 v.3.0.0 migration document. "Configurable ATT_MTU" section contains information you need.

    You can also find an example on how to enable DLE and increase ATT_MTU for SDK 12 in this post.

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