ESP8266

FW for ESP8266 used with 3D printer

##Description
Thanks to @disneysw for bringing this module idea and basic code
Thanks to @lkarlslund for suggestion about independant reset using GPIO2

Have a bridge configurable by web and optionally by printer
Have a front end to know what is the wifi status or know what is the print status - this part can be optional and removed by compilation directive if no need
...
TBD

##Hardware connection
--Use GPIO2 to ground to reset all settings in hard way - 2-6 sec after boot / not before!! Set GPIO2 to ground before boot change boot mode and go to special boot that do not reach FW - I did not found information on this. Currently boot take 10 sec - giving 8 seconds to connect GPIO2 to GND and do an hard recovery for settings
--Use GPIO0 to ground to be in update mode
--Use a switch to reset/disable module
--Use GPIO2 connected to a printer pin to interrupt the bridge loop if need change configuration (may be not necessary if no performance impact of allowing ESP screening commands - TBT - TBC) no need anymore
--TODO: Full wiring with drawing
TBD

##Development
Currently using Arduino IDE 1.6.3 with the stand alone esp8266 module 0.0.3 (https://github.com/sandeepmistry/esp8266-Arduino)
Full IDE from https://github.com/esp8266/Arduino can be used

Additionnaly:
--Use minimal css from http://getbootstrap.com/examples/theme/ if connected to internet, this is to get better UI and rendering according display device (link can be changed in FW), if not available ,CSS is ignored displaying basic HTML
--Some Javascript is used to enhance web UI - very limited but I expected so error depending browser so will try to limit usage (test done using chrome/IE looks Ok but no time for safari/firefox/opera/etc...)

##Flash the Module
*Tools:
--Use IDE to upload directly
--Use esp flasher: https://github.com/nodemcu/nodemcu-flasher for 0x00000 and 0X00004 binaries

*Connection --Connect GPIO0 to ground to be in update mode

##Wifi connection
*Wifi Mode : Access point / Client station (not sure it is useful to handle AP/STA in same time as make configuration more complex, but use AP/STA only to help the configuration mode = be able to scan other AP/ test connection when in AP mode )
*IP Generation: DHCP/Static IP
*IP/MASK/GATEWAY for static data
*Usage: Bridge/Front End no need anymore
*Baud Rate for serial (supported : 9600, 19200, 38400, 57600, 115200, 230400)
...
TBD

##Configuration
Default Settings:
AP:ESP8266
PW:12345678
IP: 192.168.0.1
Mask: 255.255.255.0
GW:192.168.0.1
Bridge Mode no need anymore
Baud rate: 9600

From web: port 80 --Need picture and flow
...
TBD

##Commands from/to serial:
*from module to printer [Need Printer FW support and can be disabled in ESP FW]
-M800 S1 , restart module done need a wifi/activity restart
-M801 [Message], Error message from module
-M802 [Message], Status message from module
-M804 [AP/STATION,SSID,DHC/STATIC,IP,MASK,GW,STATUS,MAC ADDRESSS, BAUD?], ]Module configuration without password
...
TBD

*from host to printer [Need Printer FW support] on port 8888
-M803 [IP, AP,SSID, Password....], ]Module configuration settings to be used by module
-M805 query to get M804 informations
...
TBD

*from printer to module [Need Printer FW support and can be disabled in ESP FW]
-request configuration/status (generate the M804 as answer)
-set AP/STATION,SSID,PASSSWORD,DHC/STATIC,IP,MASK,GW,BAUD from serial
...
TBD

##Front End [need Printer FW support it] or just display module status --Display printer status
--Display temperatures
--Display print progress if any
--List SDCard Content
--Launch/Stop/(Pause?) a Print

##TODO
-- Define Front End Functions
-- do the bridge serial/TCPIP -- do coding
-- do testing
-- do a complete drawing for connections
-- show available AP in web page and allow to select -- show connected clients if in AP -- need to display wifi information in front end -- need to display MAC address in front end/ configuration to help if MAC filtering on router is necessary

more to come