https://arduino-esp8266.readthedocs.io/en/latest/ota_updates/readme.html
#ifndef __WIFI_CREDENTIALS_H
#define __WIFI_CREDENTIALS_H
#ifndef STASSID
#define STASSID "ssid"
#define STAPSK "key"
#endif
#endif // __WIFI_CREDENTIALS_H
see templ_platformio_ini
[env:<BOARD>]
platform = espressif8266
board = <BOARD>
framework = arduino
monitor_speed = 115200
extra_scripts = pre:extra_script.py
; stuff for OTA
; https://docs.platformio.org/en/latest/platforms/espressif8266.html#over-the-air-ota-update
upload_protocol = espota
upload_port = <IPADRESS>
upload_flags =
--port=8266
--auth=admin
lib_deps =
ottowinter/PCA9685 16-Channel PWM Driver Module Library @ 1.2.9