serial wifi module HLK-RM04

This little module has 2 uart, and can be used as AP as well.
the manual is quite buggy, So I note the real thing I have on my set.

default SSID is kind of HI-LINK_1B29
default pwd: 12345678
web config page: 192.168.16.254
log in as admin, pwd: admin
the tricky one is the TCP port:
it sould be 192.168.16.254:8080
default serial config:115200,8N1

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