How to request Ebox wifi with modbus

I've never used modbus before.

I have an eBox-Wifi Epever connected to an MPPT charge controller TRIRON for solar power.

I was able to make it connect to my wifi and now has an accessible IP : 192.168.39.149

I just want to extract some data from it, battery Voltage, etc...

On http://192.168.39.149:80, i have a web interface for administration. (Which is not what i want.)

After an nmap, I see that there is port 8088 open. (Can use modbus there maybe ? no web interface on this port.)

I installed and used modbus_cli like that modbus -b 115200 -p 1 192.168.39.149:8088 3101 but I can't make it return anything...

https://files.i4wifi.cz/inc/_doc/attach/StoItem/7068/MODBUS-Protocol-v25.pdf

http://www.solar-elektro.cz/data/dokumenty/1733_modbus_protocol.pdf

https://github.com/favalex/modbus-cli

EDIT : I changed for baud 9600 and port 502. (Which are the defaults for modbus ?)

Solution

Try python modpoll tool with the following configuration, install modpoll via pip install modpoll if not installed.

Create a local config file, e.g. epever.csv, only added voltage/current/power values for testing.

device,mydevice,1,,,
poll,holding_register,12544,4,BE_LE,
ref,PV_array_input_voltage,12544,uint16,r,V,0.01
ref,PV_array_input_current,12545,uint16,r,A,0.01
ref,PV_array_input_power,12546,uint32,r,W,0.01

poll local device,

modpoll --tcp 192.168.39.149 --tcp-port 8088 --config epever.csv

The configuration assumes you keep the device ID = 1 (default), and use BE_LE endian, please adjust endian setting according to the platform running on.