access to hilink web interface from remote host

Aug 11, 2025 • iptables

hilink usb dongle on remote host

remote host

sysctl -w net.ipv4.ip_forward=1
iptables -t nat -A PREROUTING --dst 10.10.10.22 -p tcp --dport 80 -j DNAT --to 192.168.8.1
iptables -t nat -A POSTROUTING -o eth2  -j MASQUERADE

local host

sysctl -w net.ipv4.ip_forward=1
sysctl -w net.ipv4.conf.all.route_localnet=1
iptables -t nat -A OUTPUT  -d 192.168.8.1  -p tcp -m tcp --dport 80 -j DNAT --to-destination 10.10.10.22
iptables -t nat -A POSTROUTING -o tap0  -j MASQUERADE

apache rewrite without 301 redirect

Sep 18, 2024 • linux, apache

/etc/apache2/conf.d/domaincheck.conf

AddDefaultCharset UTF-8
Alias /domainchecker "/srv/www/htdocs/domainchecker"
<Location "/domainchecker">
    DirectoryIndex index.php
    RewriteEngine On
    RewriteBase /
    RewriteCond %{REQUEST_FILENAME} -d
    RewriteRule ^(.+[^/])$ $1/ [L]
</Location>

<Directory "/srv/www/htdocs/domainchecker">
    DirectorySlash Off
    Options -Indexes +FollowSymLinks
    Require all granted
</Directory>

modbus cli tcp, mbpoll and moodbus_cli

Mar 17, 2024 • modbus, cli

sinotimer

mbpoll phase A,B,C

zei0mucu:~$ mbpoll -a 8 -t 3:float -B -0 -r0,2,4 172.16.100.101 -1 -q 
-- Polling slave 8...
[0]:    234.282
[2]:    234.666
[4]:    237.221

mbpoll phase A

zei0mucu:~$ mbpoll -a 8 -t 3:float -B -0 -r0 172.16.100.101 -1 -q 
-- Polling slave 8...
[0]:    235.587

modbus_cli, voltage phase A,B,C

zei0mucu:~$ modbus -S 172.16.100.101 -s 8 i@0/f
236.30426025390625
zei0mucu:~$ modbus -S 172.16.100.101 -s 8 i@2/f
233.90081787109375
zei0mucu:~$ modbus -S 172.16.100.101 -s 8 i@4/f
237.7670135498047

relay

modbus_cli

on relay 1

zei0mucu:~$ modbus 127.0.0.1  -s 2  -v   c@0=1
Parsed 0 registers definitions from 1 files
→ < 97 58 00 00 00 06 02 05 00 00 ff 00 >
← < 97 58 00 00 00 06 02 05 00 00 ff 00 > 12 bytes

off relay 2

zei0mucu:~$ modbus 127.0.0.1  -s 2  -v   c@1=0
Parsed 0 registers definitions from 1 files
→ < fa 49 00 00 00 06 02 05 00 00 00 00 >
← < fa 49 00 00 00 06 02 05 00 00 00 00 > 12 bytes

status

zei0mucu:~$ modbus 127.0.0.1  -s 2  -v   c@0/8B
Parsed 0 registers definitions from 1 files
→ < bd 43 00 00 00 06 02 01 00 00 00 08 >
← < bd 43 00 00 00 04 02 01 01 00 > 10 bytes
← [0, 0, 0, 0, 0, 0, 0, 0]
0: 0 0x0

mbpoll

relay 1

zei0mucu:~$ mbpoll -a 2  -t 0  -0 -r0 127.0.0.1 -q -- 1
Written 1 references.

relay 2

zei0mucu:~$ mbpoll -a 2  -t 0  -0 -r1 127.0.0.1 -q -- 1
Written 1 references.

status

zei0mucu:~$ mbpoll -a 2  -t 0  -0 -r0 127.0.0.1 -q  -1 -c8
-- Polling slave 2...
[0]:    1
[1]:    1
[2]:    0
[3]:    0
[4]:    0
[5]:    0
[6]:    0
[7]:    0

Modbus-Rtu 2 Channel 7-24V Relay Module

Feb 23, 2024 • modbus, cli

install modbus command line tool

pip3 install modbus_cli

setup udev rules for usb QinHeng Electronics CH340 serial converter

#cat /etc/udev/rules.d/98-usb-serial.rules
KERNEL=="ttyUSB*", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", OWNER="hass", GROUP="users", MODE="0660", SYMLINK+="rs485"

relay control

# 1
# on 
modbus   -b 9600   -s 2  -v   /dev/rs485  c@0=1
# off
modbus   -b 9600   -s 2  -v   /dev/rs485  c@0=0
# status
modbus -b 9600 -s 2  -v /dev/rs485  c@0/8B | egrep -o '\[.*\]' | tr -d '[,]' | cut -f1 -d' '
# 2
# on 
modbus   -b 9600   -s 2  -v   /dev/rs485  c@1=1
# off
modbus   -b 9600   -s 2  -v   /dev/rs485  c@1=0
# status
modbus -b 9600 -s 2  -v /dev/rs485  c@0/8B | egrep -o '\[.*\]' | tr -d '[,]' | cut -f2 -d' '

write data to influxdb with curl

Nov 12, 2023 • linux, influxfb

systemd unit file

# /etc/systemd/system/influx-send.service
[Unit]
Description=send data to influx 
After=syslog.target network.target
[Service]
Type=simple
ExecStart=/usr/local/sys/influx/influx-send.sh
[Install]
WantedBy=multi-user.target

shell script /usr/local/sys/influx/influx-send.sh

#!/bin/bash
while true; do
find /var/spool/emeter -type f -exec sh -c "curl -o /dev/null -w \"%{http_code}\" --user 'username':'password' -sS -X POST http://192.168.110.16:8086/write?db=emeter -d @{} | grep -q  204 && rm  {}" \;
sleep 60
done

sample data from /var/spool/emeter/*

voltage,stand=diesel-new,phase=A value=218 1699828098942885595

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