J.C. NelsonAfter my last post, I went back and studied how code that actually can initialize the board correctly worked. With a little borrowed code from micropython sample, I was able to initialze the board successfully, and communicate outbound at much faster rates. Inbound data works in a test sketch, but not in Marlin yet. Now I can use USB instead of having to wire up to the serial1 via a FTDI clone.
Now I have an ESP8266 hooked to Serial1 and output via USB, so in general, this is very good.
Notes on the ESP module - For some reason, if I plug into USB, it cuts power to the ESP8266 module. These two do not share the same pins, so there's no logical reason I can find for this. Marlin supports two serial ports in 2.x, so it would be nice to enable both. Perhaps there's a cutoff circuit on the expansion module that can be disabled - I'm not sure yet.
I'm just happy to be able to send and receive data via USB.
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The NRST pin does in fact reset the printer (I kind of like this - it means we can have a second fail-safe at some point). I'd guess the other board has a different default state, for reasons I do not understand. I'm not ready to even think of writing custom ESP8266 code but it would be feasible to have it watch the temperatures and enact failsafes that reset theprinter.
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Your correct, on the lerdge S, X and K when I plug the PC to the printer you see the WiFi module red led go out and no more WiFi connection. Now another thing I found odd, the Latest Lerdge WiFi module ESP8266, if you Hot plug it in it reboots the lerdge printer board. but the dump I made from this WiFi module when installed on another china made ESP8266 it works the same except when Hot plugged in it did not reboot the Lerdge board.
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