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

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

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

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

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

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

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

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

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

pip3 install modbus_cli

#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"

# 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' '

# /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

#!/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

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

#!/usr/bin/python3
# -*- coding: utf-8 -*-

import libscrc
import serial
import sys
import struct
def str_to_bytes(data):
    return [hex(ord(c)) for c in data]
port=sys.argv[1]
addr=sys.argv[2]
def get_value(data,port,addr):
    crc16 = libscrc.modbus(data)
    crc16_str = '0x{:04x}'.format(crc16)
    data.append(int(crc16_str[2:][2:4],16))
    data.append(int(crc16_str[2:][0:2],16))
    ser = serial.Serial(port,9600,timeout=0.1,bytesize=8,stopbits=1,parity='N',writeTimeout=0)
    ser.write(data)
    line = ser.read(100)
    ret = (''.join('{:02x}'.format(ord(x)) for x in line))
    val = struct.unpack('>f',line[3:7])[0]
    return "%.3f" % val
    ser.close()
data = bytearray(b'\x00\x04\x00\x00\x00\x02')
data[0]=int(addr)
voltage = get_value(data,port,addr)
data = bytearray(b'\x00\x04\x00\x08\x00\x02')
data[0]=int(addr)
current = get_value(data,port,addr)
data = bytearray(b'\x00\x04\x00\x12\x00\x02')
data[0]=int(addr)
power = get_value(data,port,addr)
data = bytearray(b'\x00\x04\x01\x00\x00\x02')
data[0]=int(addr)
power_total = get_value(data,port,addr)
print("U="+voltage+" I="+current+" P="+power+" W="+power_total+"|U="+voltage+";; I="+current+";; P="+power+";; "+"W="+power_total+";; ")

    upstream backend13 {
    # sticky - link backend by cookies
    # must build nginx with  --add-module=/usr/local/src/nginx-goodies-nginx-sticky-module-ng
    sticky;
    server 127.0.0.1:6001;
    server 127.0.0.1:6002;
    server 127.0.0.1:6003;
    }
    upstream backend47 {
    sticky;
    server 127.0.0.1:6004;
    server 127.0.0.1:6005;
    server 127.0.0.1:6006;
    server 127.0.0.1:6007;
    }
    map $http_x_backend $backend {
    default backend13;
    13      backend13;
    47      backend47;
    }

        location / {
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $host;
            proxy_pass http://$backend;
        }

    set_real_ip_from  127.0.0.1/32;
    real_ip_header    X-Forwarded-For;

curl -c curl_cookie -b curl_cookie -sS  --header "X-Backend: 13" http://192.168.0.65/