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wiced_bt_dev_register_hci_trace() API is used to register the HCI callback where you can send the data to the host.
wiced_transport_send_hci_trace() is the API used to send the data to the host.
When the callback is triggered, check the p_data field, it contains the opcode and the data. If the opcode matches HCI_CONTROL_GROUP_SPP, then use the wiced_transport_send_hci_trace() API to send data to host.