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esp_hf_client_register_data_callback() function
Register HFP client data output function; the callback is only used in the case that Voice Over HCI is enabled.
Syntax
esp_err_t esp_hf_client_register_data_callback(esp_hf_client_incoming_data_cb_t recv,
esp_hf_client_outgoing_data_cb_t send);
Return value
- ESP_OK: success - ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled - ESP_FAIL: if callback is a NULL function pointer