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@Steffen
It doesn't make any difference for me, but the device is only 5 m away from the access point.
This command is definitely useful, but there seems to be a little more investigation desirable.
The inquiry (AT+RFPOWER?) returns with an error. The ESP docs say something about disabling a pin (which I didn't know how to do). Also there is an acompanying command AT+RFVDD which seems to do the same thing or is even more powerful .
While RFPOWER takes numbers as argument, there seems to be a direct conversion to dbm, which might be more desirable? If RFVDD works, it seems to be a voltage.
In summary: quite a few people might like a new setRfPower(x), a complementary
getRfPower() would be even better.