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esp_hf_ag_volume_control() function
Volume synchronization with HFP client. As a precondition to use this API, Service Level Connection shall exist with HFP client.
Syntax
esp_err_t esp_hf_ag_volume_control(esp_bd_addr_t remote_bda,
esp_hf_volume_control_target_t type,
int volume);
Return value
- ESP_OK: volume synchronization control is sent to lower layer - ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled - ESP_ERR_INVALID_ARG: if arguments are invalid - ESP_FAIL: others