Just for my information, how do you provides SSID and Secrets for the dedicated Wifi network ? i have take a look to your code and initially it seems to comes from preferences, but i do not see how you fill your secrets.
Can you explain to me?
Personnally i use an had-hoc wifi manager to enter secrets

Regards

Did you think it is possible to send the bin-file via a base64 encoded payload and then the update mechanism works.
Maybe you tried this before, do you have expirences on that?

BR
Olli

Hi, thank you for sharing this, it helped me to add OTA to my project :)

But I had to change

// check contentLength and content type
if (contentLength) && isValidContentType) {

to

// check contentLength but SKIP contentType VALIDATION
if (contentLength) {

to make it work. I don't understand how or why, maybe it is because I created the .bin file with the arduino IDE or missed some settings to set the content type. But it works fine if I just "disable" the validation :)

Cheers and thanks again!