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V: 1.00 Revised: Jan 2021
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AcuRev 2100 Series Power Meter: Web Manual
7.9.3 MQTT Encryption
The SSL/TLS tab allows users to use the MQTT protocol with encryption.
On this page, users will be able to upload the required certicate and key les.
7.9.4 Last Will & Testament
The AcuRev 2100 supports Last Will and Testament messages via the MQTT protocol. These
settings can be congured under the Last Will & Testament tab.
The last will and testament message are used to notify other clients regarding other
disconnected clients. The message is an MQTT message that contains a topic, a QoS level and
a payload.
• Topic: Refers to the path used to access the MQTT message.
• QoS: Stands for Quality of Service and refers to the reliability of the message delivery
between the publisher and subscriber. There are three types of quality of service:
• QoS 0 - is the lowest level, and is dened as “at most once” delivery. This level has the
fastest message delivery but the success rate of delivery is not reliable.
• QoS 1 - is dened as “at least once” delivery. These types of messages are reliable and
are guaranteed, however, the messaged may be sent as duplicates several times.
• QoS 2 - Is the highest level, and is dened as “exactly once” delivery. These messages
are more reliable and are guaranteed to be sent once without any duplicates. This
type of messaging sends the most reliable message however it has a slower message
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