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By martinayotte
#69860 The SDWebServer example simply do that for many kind of files :
https://github.com/esp8266/Arduino/blob ... Server.ino
Then, you can use the WebUpdater.ino to get the file by providing the URL pointing to your SDWebServer.
https://github.com/esp8266/Arduino/blob ... pdater.ino
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By martinayotte
#69892 Do you mean reading it own firmware and send it to the other ESP ?
Pretty easy : simply use ESP.flashRead() function in a loop until the end of the firmware.
Take a look at ESP.getSketchMD5() function, it is pretty similar to calculate the MD5 by reading firmware byte per byte.