MQTT

Cloud connectivity

MQTT is a TCP/IP messaging protocol mainly

used for lightweight messaging to the cloud.

In the environment of MQTT, edge devices like

controllers act as clients and communicate with

a broker situated in the cloud.

They publish data based on events using topics.

Other clients like SCADA systems or monitoring

applications can subscribe to these topics and

receive data as they arrive. This enables the easy

and low-bandwidth connection of many devices.

AC500 V3 uses TLS encryption to establish secure

communication.

Secure connectivity

Remote units

AC500 works as edge-gateway and is directly

connected to the cloud. Security is established

through TLS encryption.

• No additional gateway required

• Low latency

Application:

Small systems with non-critical data transfer.

Network security

Connection of the whole AC500 network to the

cloud using a separate gateway. Enhanced

security is provided through additional firewall

and/or VPN.

• Advanced level of security

• Easy integration of many edge devices

Application:

Large systems with many devices which need

higher protection.