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This version of the firmware is the first version really targeted directly at the FreeFi232 hardware. It is aware of the hardware flow control select jumper, and also controls the additional RS232 signals available on the FreeFi232 hardware. It is aware of, but ignores, the DTR signal.
This version of the firmware is still targeted directly at the NodeMCU board. There are errors in the schematic, but I'd recommend using this release if you wish to use a NodeMCU together with a level shifter. Later versions start to be targeted towards the FreeFi232 hardware.