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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 ( IPAddress ip, uint16_t port = 8883, bool cleanSession = true, uint16_t

keepalive_sec = MQTT_KEEPALIVE_DEFAULT)

Establishes a secure connection with the specified MQTT broker.

Parameters:

ip: The IP address of the MQTT broker

port: The port to use (default = 8883)

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

(based on the 'Client ID' value set in the constructor):

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