pc-ble-driver - Connection Request Failed, reason 4

[Frederik]

Hi, I am trying to connect 4 devices with the pc-ble-driver. Therefore I modified the heartrate example.

3 Devices are connecting fine - on the 4th connection request I get: Connection Request Failed, reason 4 => No Memory for operation

In ble_stack_init() ble_enable_params.gap_enable_params.central_conn_count is set to 4.

If I try to connect 4 devices with nRFConnect 2.1.0 instead - all is working fine!

What is the difference here?

Also I am still facing the question: Which optimisations in FW or on pc-ble-driver side can I perform for maximum throughput with pc-ble-driver to 4 central(only) connections?

regards

Frederik

[Jørgen Holmefjord]

MAX_PEER_COUNT should not cause this error, unless you have modified the example to use this define in another way. Is the error returned from the call to sd_ble_gap_connect()? From the API documentation, NRF_ERROR_NO_MEM is caused by "The configured memory pool (see ble_conn_bw_counts_t) is not large enough for the bandwidth selected for this connection". Are you setting BLE_COMMON_OPT_CONN_BW using sd_ble_opt_set() in your code? What value do you pass to p_conn_bw_counts in param to sd_ble_enable()?