ESPHome lets makers adjust how an SX127x radio finds the frequency of an incoming signal. The fixed default was too narrow for some wireless M-Bus meter transmissions, producing damaged data and missed messages before the radio could lock on.
Hajo Noerenberg compared two consecutive four-hour runs on the same ESP32-C3 and SX1276 setup receiving a real meter. A wider correction filter received 50% more messages in that test. The option applies to FSK and OOK radio modes; LoRa is outside its scope.