Just started to play with updating OTA on an ESP8266, and have got everything working, but failing at the last hurdle. I’m using the standard Blynk.edgent / Edgent_8266 sketch, can get Blynk.air and the device talking, and when I create a new shipping for an updated sketch (just incrementing BLYNK_FIRMWARE_VERSION), the 8266 connects and starts to download the new f/w. Then this is the output of the debug monitor:
[8836] Flashing...
10%
20%
30%
40%
50%
60%
70%
80%
90%
ERROR[0]: No Error
[34701] Write failed. Written 468336 / 469008 bytes
ets Jan 8 2013,rst cause:2, boot mode:(3,6)
load 0x4010f000, len 3460, room 16
tail 4
chksum 0xcc
load 0x3fff20b8, len 40, room 4
tail 4
chksum 0xc9
csum 0xc9
v00072750
~ld
[392]
The Written number (468336 in the above example) is sometimes lower, sometimes higher, but the device always seems to crash out. By default, this will happen 3 times in 24hours before it does it all again.
What am I missing here? I have the right device selected in the Arduino IDE, I have the right device selected in the sketch (and have tried with a Node MCU with the same result). The device will happily flash via USB, just not OTA.