Page 65 of 74 Shezhen Beilai Technology Co., Ltd V1.1
Cellular IoT M2M RTU --- S272/S274/S275
7.2 BLIIoT MQTT Cloud
There are three kinds of identities in the MQTT protocol: Publisher (Publish), Broker (Broker) (server),
and Subscriber (Subscribe). Among them, the publisher and subscriber are both clients, the broker is
server, and the message publisher can also be a subscriber. Take S27X connected to BLIIoT cloud
2.0 platform as an example:
When device publish I/O point data:
Publish Publish Broker Publish Subscribe
S275 BLIIoT Cloud Subscribe (Account)
When customer control the device:
Subscribe Publish Broker Publish S275
(Account) BLIIoT Cloud Subscribe Account
Enter MQTT Client ID
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