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MQTT_KEEPALIVE_DEFAULT)

This function will attempt to connect to the Adafruit IO servers using a standard (unencrypted) connection.

Parameters:

cleanSession: Indicates whether the client and broker should remember 'state' across restarts and reconnects.

'State' maintenance is based on the Client ID so be sure to set a reusable value via .clientID if you set

cleanSession to false!:

If set to false (0) both the client and server will maintain state across restarts of the client, the server and the

connection. As state is maintained:

Message delivery will be reliable meeting the specified QOS even if the client, server or connection

are restarted.

The server will treat a subscription as durable.

If set to true (1) the client and server will not maintain state across restarts of the client, the server or the

connection. This means:

Message delivery to the specified QOS cannot be maintained if the client, server or connection are

restarted

The server will treat a subscription as non-durable

keepalive_sec: This value defines the maximum interval (in seconds) between messages being sent or received.

Setting a value here ensures that at least one message is sent between the client and the broker within every

'keep alive' period. If no data was sent within 'keepalive_sec' seconds, the Client will send a simple ping to the

broker to keep the connection alive. Setting this value to '0' disables the keep alive feature. The default value is

60 seconds.

Returns: 'True' (1) if the connection was successful, otherwise 'false' (0).

bool connectSSL (bool cleanSession = true, uint16_t keepalive_sec =