Add delay after reset option about esptool-ck HOT 3 OPEN

After chatting with @me-no-dev in the gitter, it may be more elegant to handle this in my bootloader. That is to discriminate the serial traffic received by my bootloader as destined for the microcontroller or destined for pass-through to the ESP8266. In any case, I still wonder if this might be a useful feature to implement?

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I think adding an argument and a corresponding arg_parse handler would be a good option.

At some point i was thinking about adding support for "scripts" which define how reset should be performed. Currently there is some C code which defines different reset methods. This works fine, but isn't very flexible. So the idea was to handle 'reset method' arguments like

-cb dtr:1,rts:1,delay:5,rts:0,delay:30,dtr:0

This way anyone could use esptool-ck with custom reset circuit, without having to modify C code.
I think this feature would work for your case as well. Does this make sense?

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Did you implemented the 'reset method' arguments already? I have this simple reset and GPIO0 insert circuit at my board http://www.ba0sh1.com/wp-content/uploads/2015/01/ESP8266-boot-select-sch.png.
DTR line is connected paralel to the reset switch. But the DTR low signal must be inserted at least for 500mS to charge the capacitor and keep the GPIO0 low when the reset conditions occured.

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