BLE_Client read Modbus register as sensor similar to Modbus controller Renogy

ESPHome
1

Hi,
anyone having an example how to read a special register via modbus protocol with ble_client?
to create a sensor and display it.

It is for a renogy mppt controller.

For example Register 0101 is holding Voltage

https://github.com/cyrils/renogy-bt/files/12787920/ROVER.MODBUS.pdf

how to implement this with ble_client?

- id: solar_battery_charge_current
    name: Panel to Battery Amps
    platform: modbus_controller
    modbus_controller_id: renogy
    address: 0x0102
    unit_of_measurement: 'A'
    register_type: holding
    value_type: U_WORD
    accuracy_decimals: 2
    filters:
      - multiply: 0.01
2

Do you have some evidence that ble data out from your charger is in modbus format?
Like uart serial emulation over ble?

3

Yes output from renogy Rover is modbus format
see micropython implementation ble on raspberry
wanted to migrate this to eSPhome
https://github.com/cyrils/renogy-bt

4

I think there is some misunderstanding .
Renogy talks modbus over rs485, Ble module BT-2 converts that to Ble. I don’t see any modbus over Ble.
So if you want to read modbus from Renogy, do it with Esphome and rs485 converter.