That’s the url to the webserver where you’ve put your compiled code (the .bin file).
If you haven’t set-up your own publicly accessible webserver, or haven’t signed-up to a web hosing service that provides a webserver for you to use, then this OTA method probably isn’t for you.
Hello. I us this code for update firmwarer, but some error ============ Checking for firmware updates. MAC address: 30AEA48436F0 Firmware version URL: http://xxx/xxxxxx.version Current firmware version: 2019081901 Available firmware version: 2019081902 Preparing to update Guru Meditation Error: Core 1 panic’ed (Cache disabled but cached memory region accessed) Guru Meditation Error: Core 1 panic’ed (IllegalInstruction). Exception was unhandled. Memory dump at 0x4014e6f0: bad00bad bad00bad bad00bad =============== i compiling bin file with arduino ide