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Assign credentials that will be used to connect to a Broker.
boost::mqtt5::mqtt_client
&
credentials(
std::string client_id,
std::string username = "",
std::string password = "");
Credentials consist of a unique Client Identifier and, optionally, a User Name and Password.
This function takes action when the client is in a non-operational state,
meaning the async_run
function has not been
invoked. Furthermore, you can use this function after the cancel
function has been called,
before the async_run
function is invoked
again.