Chengdu Ebyte Electronic Technology Co.,Ltd.
E90-DTU(433L30E)-V8 User Manual
Copyright ©2012–2022,Chengdu Ebyte Electronic Technology Co.,Ltd.
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Fixed-point sending demo:
Sending from DEV01 to DEV02 needs to add 00 05 05 (HEX) before the data;
Sending from DEV02 to DEV01 needs to add 00 0A 0A (HEX) before the data;
4.3. Ethernet part
4.3.1. IPAcquisition
Dynamic acquisition (DHCP):
The dynamic acquisition device will automatically obtain the IP address and subnet mask from the router and
synchronize the router's gateway and DNS server. Therefore, in the dynamic acquisition mode, only the working
mode and target parameters of the device can be configured.
Static configuration (STATIC):
You need to manually configure the device's IP (factory default: 192.168.3.7), subnet mask (factory default:
255.255.255.0), gateway (factory default: 192.168.3.1), DNS server (factory default: 114.114.114.114) and other
parameters , the configuration is to ensure that the communication devices are located in the same network segment
and to avoid IP conflicts, otherwise the device cannot pass through and configure the web page normally.
4.3.2. Device Port
random port:
TCP client, UDP client, HTTP client, MQTT client can configure the local port to 0 (use random local port), and
server mode cannot use random port, otherwise the client cannot establish the 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 on the web page, it will
automatically configure a random port, which can be customized to cancel.
Static port:
