Channel Ports - Ebyte NB183 User Manual

Eight serial port server

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Chengdu Ebyte Electronic Technology Co.,Ltd.

NB183S&NB183_User Manual

Alibaba Cloud MQTT platform communication test:

4.5 Channel ports

random port:

The TCP client, UDP client, HTTP client, and MQTT client can configure the local port to 0 (use a random local port),

and the server mode cannot use a random port, otherwise the client cannot establish a connection correctly (the device

does not correctly port listening).

Using a random port connection can quickly re-establish the connection when the device disconnects from the server

unexpectedly, preventing the server from rejecting the connection due to four waves of incompleteness. It is

recommended to use a random port in client mode.

When the device configures the TCP client, HTTP client, and MQTT client mode in AT, it will automatically configure a

random port, which can be canceled by definition.

static port:

Device fixed port (factory default use: 8001-8008), TCP server mode device listens to the configured port, accepts client

connection request and establishes a connection for data communication, TCP client mode device fixed port initiates

connection request.

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