MQTT - System Protobuf TCP

4 min

Overview

MQTT - System Protobuf TCP integration enables an Edge System to connect with a System Protobuf broker.

Supported Versions

MQTT Protocol version 3.1.0

MQTT Protocol version 3.1.1

Supported Communication

Outbound (Publish data from Edge to MQTT Broker) - Yes

Inbound (Subscribe data from MQTT Broker to Edge) - Yes

Configurations

Variable	Detail	Required
Name	Enter a name for the connector	Yes
Hostname	IP Address or Server FQDN of MQTT broker (Must be reachable from the Edge system)	Yes
Port	MQTT broker port	No
ClientID	Unique client identity. If left blank, a default value is auto-generated.	Yes
Username	User name	Yes
Password	User password	Yes
QoS	The Quality of Service (QoS) level is an agreement between the sender of a message and the receiver of a message that defines the guarantee of delivery for a specific message. You can publish several messages simultaneously. When you publish, a larger value allows more throughput but may lead to packages losing messages despite assigning QoS=1. Note: the QoS option depends upon the server configuration.	No
Parallel publish count	For example, Mosquitto has the following options: max_queued_messages (100 by default) max_queued_bytes (0 by default) According to the Mosquitto documentation, once this limit has been reached, subsequent messages are silently dropped. You can modify the server configuration or set this value in accordance with the server option.	Yes
Topic	Default topic for publishing or subscribing	Yes
Throttling limit	Set a limit on the number of outbound messages per second. If sending data to a server that has restrictions on the rate of incoming messages, this ensures that no messages are lost.	No
Persistent storage	If enabled, messages in the outbound queue are stored on disk. If there are interruptions in connection or power loss, messages will be retained and eventually sent when the connection is restored.	No
Queue mode	Select the sequence of data transfer: FIFO or LIFO. Selecting FIFO (First In First Out) will send the earliest message first. Selecting LIFO (Last In First Out) will send the latest message first.	No

Compatibility Validation

This information is just for reference. More products and versions may be supported provided they are compatible with the supported version as mentioned above.

Product	Version	Date
Mosquitto Message Broker	1.x	Nov 14, 2019
HiveMQ	2.x	Nov 14, 2019