What’s your experience with the ‘no calibration’ deep sleep mode? The ESP documentation claims that it dramatically lowers power consumption on wakeup.
I am particularly interested in the impact it has on Wifi performance. I could not find any documentation on that.
I did find an interesting piece of information, however. With the default sleep mode, the calibration frequency is controlled by a setting stored in the flash. The value x of byte 108 in esp_init_data_default.bin indicates that every x-th wakeup should be performed with RF calibration. For my 2MB module, that section of flash starts at 0x1fc000 (+ 108 bytes for the value of interest).