Anyhow, after watching a "discussion" evolve on the VCFED forum around all the modem control lines being available, I figured it might be nice to make something complete including DTR/DSR/DCD and RING - all of which should be easy to implement via software. I'd really welcome some feedback on the schematic. It's fairly straight forward - it implements the MAX3237 application note and the Arduino IDE ESP8266 programming circuit. Is it worth including a jumper to turn on hardware flow control and swapping the dtr/rts routing pads for jumpers? I'm prepared to make the PCB a bit larger than my original iteration, so jumpers instead of pads are feasible. Is a micro-usb a sensible power source, alongside a pair of power pins?
Anything else?

d.