Function esp_idf_hal::sys::esp_mqtt_client_unsubscribe

source · 
pub unsafe extern "C" fn esp_mqtt_client_unsubscribe(
    client: *mut esp_mqtt_client,
    topic: *const i8
) -> i32
Expand description

@brief Unsubscribe the client from defined topic

Notes:

  • Client must be connected to send unsubscribe message
  • It is thread safe, please refer to esp_mqtt_client_subscribe_single for details

@param client MQTT client handle @param topic

@return message_id of the subscribe message on success -1 on failure