Bash and Wnindows CMD scripts for updating multiple WLEDs.

tools/multi-update.cmd

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+@echo off
+SETLOCAL
+SET FWPATH=c:\path\to\your\WLED\build_output\firmware
+GOTO ESPS
+
+:UPDATEONE
+IF NOT EXIST %FWPATH%\%2 GOTO SKIP
+	ping -w 1000 -n 1 %1 | find "TTL=" || GOTO SKIP
+	ECHO Updating %1
+	curl -s -F "update=@%FWPATH%/%2" %1/update >nul
+:SKIP
+GOTO:EOF
+
+:ESPS
+call :UPDATEONE 192.168.x.x firmware.bin
+call :UPDATEONE ....

tools/multi-update.sh

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+#!/bin/bash
+FWPATH=/path/to/your/WLED/build_output/firmware
+
+update_one() {
+if [ -f $FWPATH/$2 ]; then
+	ping -c 1 $1 >/dev/null
+	PINGRESULT=$?
+	if [ $PINGRESULT -eq 0 ]; then
+		echo Updating $1
+		curl -s -F "update=@${FWPATH}/$2" $1/update >/dev/null
+		return 0
+	fi
+	return 1
+fi
+}
+
+update_one 192.168.x.x firmware.bin
+update_one 192.168.x.x firmware.bin
+# ...