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The main issue here is speed.If you program your commands in a batch, it will work Ok.I am using it now for a few month in my weather station with updates every 5 minutes.this works well. Important is also to reset theESP after each execution.
Got it working! seems I was a bit slow in typing commands. This resulted in time-out of the browser :)
Only when programming the ESP
this problem is solved. See questions above...
clear all libraries from the Arduino library