Windows USB serial workaround: set DTR after RTS

[haileys]

When setting DTR before RTS, espflash can't connect to a USB serial device on Windows:

After changing the order, it can:

Strange but true!

esptool itself features a similar workaround - it additionally sets DTR to its last known state whenever RTS is set. For our purposes though, it seems good enough to just switch the order we set the pins.

[SergioGasquez]

Thanks for the fix! I wonder if we should also update the UsbJtagSerialReset order.

esptool itself features a similar workaround - it additionally sets DTR to its last known state whenever RTS is set.

I wonder if we could easily store the value of dtr and rts and do like esptool does, when setting rst set the current value of dtr, so we can keep the same order as esptool while have this Windows workaround

[SergioGasquez]

I've also added the changes for UsbJtagSerialReset in https://github.com/SergioGasquez/espflash/tree/fix/windows-reset. Do you have by any chance a devkit with jtab port available by any chance to confirm if the issue is also present there and my changes fix it?