Function paho_mqtt_sys::MQTTAsync_isConnected

pub unsafe extern "C" fn MQTTAsync_isConnected(handle: MQTTAsync) -> c_int

This function allows the client application to test whether or not a client is currently connected to the MQTT server. @param handle A valid client handle from a successful call to MQTTAsync_create(). @return Boolean true if the client is connected, otherwise false.