Modbus communication with Deye inverter SUN2000-50K

I'm trying to send MODBUS_RTU active power reading commands to a Deye SUN-50K inverter via RS485 interface, using an ESP32_WROOVER.
However, when I repeat the command, a sequence of meaningless bytes appears.
The inverter randomly responds correctly or incorrectly.
Another problem: if I keep the inverter's Wi-Fi interface connected, it seems that this interface sends data in parallel via RS485 channel.
Has anyone had this problem?

Could be many things, you give little to go on.

What is your code?
What is the hardware connection?
What is the manual specifying data transfer?

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