Test your knowledge

1. The Eclipse Paho JavaScript client provides:

   1. Only a non-blocking (asynchronous) API.

   2. Only a blocking (synchronous) API.

   3. Both a blocking (synchronous) and a non-blocking (asynchronous) API.

2. In the Paho JavaScript API, the Paho.MQTT.Client object represents:

   1. The synchronous MQTT over WebSockets client.

   2. The asynchronous MQTT over WebSockets client.

   3. The asynchronous MQTT over TCP client (no WebSockets).

3. After the Paho.MQTT.Client instance establishes a connection with the MQTT server, the callback assigned to which of the following attributes of the connectOptions object passed as an argument to the connect function will be called?

   1. connectCallback.

   2. onSuccess.

   3. onConnect.

4. After the Paho.MQTT.Client instance receives a message from one of the topic filters to which it has subscribed, the callback assigned to which of the following attributes of the connectOptions object passed as an argument to the connect function will be called?

   1. onMessageReceived.

   2. messageReceivedCallback.

   3. onMessageArrived...