OTA: upload a custom firmware.bin from the web UI - #175
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Builds against framework-espidf 5.5.0 fail with implicit-declaration errors for GPIO_IS_VALID_GPIO and gpio_wakeup_enable in deep_sleep / light_sleep. driver/rtc_io.h no longer pulls in driver/gpio.h transitively on this IDF version.
The existing OTA flow fetches an HTTPS image from a hardcoded GitHub URL, which is unusable when developing patches against a fork. Add a file picker + raw-binary POST upload to the OTA page. Frontend: ota.html grows a "Upload custom firmware" section with file input, a flash button, and an inline progress bar. Submission uses fetch/XHR with the File object as the request body — no multipart parsing on the device side. Backend: src/urihandler/uploadfwhandler.c streams the body in 4 KB chunks straight through esp_ota_write() to the inactive OTA slot, calls esp_ota_set_boot_partition() on success, and schedules a 2-second restart via the existing restartByTimer infrastructure. Lock-aware (redirects to /lock when UI is locked). NVS is not touched, so settings survive.
This was referenced May 23, 2026
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/otaonly fetches a hardcoded GitHub URL — breaks any workflow that wants to flash a dev build or a fork without USB access.POST /uploadfwaccepts the firmware as the raw request body (no multipart). The handler streams 4 KB chunks straight intoesp_ota_write()on the inactive partition, callsesp_ota_set_boot_partition(), schedules a 2s restart via the existingrestartByTimerinS(). Lock-aware. NVS untouched, settings survive.pages/ota.htmladds a file picker + a confirm-on-click button + an inline progress bar; XHR withContent-Type: application/octet-stream.Tested live: 1.4 MB upload → HTTP 200 in 8.8s → reboot in ~1s → device back on the same IP with all settings.
Complements #176 (edit the OTA URL instead of replacing the path). First commit is a build-fix shared with #174/#176.