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Serial::end hang (#5047)

workaround for #5043. There is a timing issue with HardwareSerial::end. I'm not sure what is hung, but it should be possible to see this in jtag, as it does cause a reboot if you let it. The delay needs to be before you detach the device!?

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cores/esp32
- HardwareSerial.cpp

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`‎cores/esp32/HardwareSerial.cpp`

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Original file line number	Diff line number	Diff line change
`@@ -117,6 +117,7 @@ void HardwareSerial::end()`
`117`	`117`	`if(uartGetDebug() == _uart_nr) {`
`118`	`118`	`uartSetDebug(0);`
`119`	`119`	`}`
	`120`	`+ delay(10);`
`120`	`121`	`log_v("pins %d %d",_tx_pin, _rx_pin);`
`121`	`122`	`uartEnd(_uart, _tx_pin, _rx_pin);`
`122`	`123`	`_uart = 0;`

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Commit 81b7c47

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`‎cores/esp32/HardwareSerial.cpp`

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