MQTT-TLS could use Amazon IoT

Firmware Libraries
13

Hi @Cameron,

  1. How do you set a message to QoS level 0?

You could this function.
bool publish(const char *, const char *, EMQTT_QOS, uint16_t *messageid = NULL);

like this.
client.publish("outTopic/message", "hello world", MQTT::QOS0);

  1. How do you set a time out of 1 minute on the connection?

This library send MQTT keep alive timeout ping in every 15 second.
TCP Layer timeout is depending on the Particle API (TCPClient).

  1. Does the library act in a non-blocking way when the connection is lost?

When MQTT or TCP connection is lost or fail, you could find that on client.isConnected() loop(see the sample source) is false.