Page Comparison

Adapter Target

Select a different adapter, please see respective documentation for more information.

Adapter Setting (MQTTServerSettings)

XmlFilePath

File path to the policy file.

ServerName

Is used as the an indicator in the xml policy file.

IP Address

The address of the MQTT broker. This can be a be in IPv4 address or a hostname like localhost

Port

The port on which the MQTT broker is running,
default port is 1883.

use TLS

Should be turned on when the broker is using TLS authentication. (off by default)

UserName

Is passed to the server for authentication if the field is not empty (not used by default).

PassWord

Is passed to the server for authentication when the UserName field is not empty (not used by default)

QoS

(Quality Of Server) is an agreement between broker and client that defines the guarantee of delivering a message:

0 : At most once => There is acknowledgement between broker and client other than regular TCP , fast, unreliable (packet loss))

1 : At least once => The sender buffers the value until a ‘PUBACK’ is returned by the broker. Message can be send multiple times (, slower, reliable)

2 : Exactly once => The sender sends the message, the broker returns a ‘PUBREC’. Sender is returning a ‘PUBREL’ and the server again returns a ‘PUBCOMP’ command to finalize the send process. (slow, very reliable)

Lifecycle settings

0

fire & forget

fast

poor

Messages can get lost in unstable connections. Very suitable for wires local connection

1

single handshake

slower

good

No message is lost. Can lead to duplicate messages. but is much faster than QoS 2

2

double handshake

slowest

exact

If it is getting the message exactly once is more important than performance. Quite an overhead compared to the other 2 levels