You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
94 lines
4.1 KiB
94 lines
4.1 KiB
# esp-httpd README #
|
|
|
|
This is the demonstration project for the small but powerful libesphttpd webserver
|
|
for ESP8266(EX) chips. It is an example of how to make a module that can have
|
|
the AP it connects to configured over a webbrowser. It also illustrates multiple
|
|
flash layouts and some OTA update functionality.
|
|
|
|
## ABOUT THE WEBSERVER ##
|
|
|
|
The Good (aka: what's awesome)
|
|
- Supports multiple connections, for eg simultaneous html/css/js/images downloading
|
|
- Static files stored in flash, in an (optionally compressed) RO filesystem
|
|
- Pluggable using external cgi routines
|
|
- Simple template engine for mixed c and html things
|
|
- Usable as an embedded library - should be easy to drop into your existing projects
|
|
- Includes websocket support
|
|
|
|
The Bad (aka: what can be improved)
|
|
- Not built for speediness, although it's reasonable fast.
|
|
- Built according to what I remember of the HTTP protocol, not according to the
|
|
RFCs. Should work with most modern browsers, though.
|
|
- No support for https.
|
|
|
|
The Ugly (aka: bugs, misbehaviour)
|
|
- Possible buffer overflows (usually not remotely exploitable) due to no os_snprintf
|
|
This can be theoretically remedied by either Espressif including an os_snprintf in
|
|
their libs or by using some alternate printf lib, like elm-chans xprintf
|
|
|
|
## SOURCE OF THIS CODE ##
|
|
The official esphttpd repo lives at http://git.spritesserver.nl/esphttpd.git/ and
|
|
http://git.spritesserver.nl/libesphttpd.git/ . If you're a fan of Github, you can also
|
|
peruse the official mirror at https://github.com/Spritetm/esphttpd and https://github.com/Spritetm/libesphttpd . If
|
|
you want to discuss this code, there is a subforum at esp8266.com: http://www.esp8266.com/viewforum.php?f=34 .
|
|
|
|
|
|
## ABOUT THE EXAMPLE ##
|
|
|
|
When you flash the example into an ESP8266(EX) module, you get a small webserver with a few example
|
|
pages. If you've already connected your module to your WLAN before, it'll keep those settings. When
|
|
you haven't or the settings are wrong, keep GPIO0 for >5 seconds. The module will reboot into
|
|
its STA+AP mode. Connect a computer to the newly formed access point and browse to
|
|
http://192.168.4.1/wifi in order to connect the module to your WiFi network. The example also
|
|
allows you to control a LED that's connected to GPIO2.
|
|
|
|
## BUILDING EVERYTHING ##
|
|
|
|
For this, you need an environment that can compile ESP8266 firmware. Environments for this still
|
|
are in flux at the moment, but I'm using esp-open-sdk: https://github.com/pfalcon/esp-open-sdk .
|
|
You probably also need an UNIX-like system; I'm working on Debian Linux myself.
|
|
|
|
To manage the paths to all this, you can source a small shell fragment into your current session. For
|
|
example, I source a file with these contents:
|
|
|
|
export PATH=${PWD}/esp-open-sdk/xtensa-lx106-elf/bin:$PATH
|
|
export SDK_BASE=${PWD}/esp-open-sdk/sdk
|
|
export ESPTOOL=${PWD}/esptool/esptool.py
|
|
export ESPPORT=/dev/ttyUSB0
|
|
export ESPBAUD=460800
|
|
|
|
Actual setup of the SDK and toolchain is out of the scope of this document, so I hope this helps you
|
|
enough to set up your own if you haven't already.
|
|
|
|
If you have that, you can clone out the source code:
|
|
git clone http://git.spritesserver.nl/esphttpd.git/
|
|
|
|
This project makes use of heatshrink, which is a git submodule. To fetch the code:
|
|
|
|
cd esphttpd
|
|
git submodule init
|
|
git submodule update
|
|
|
|
Now, build the code:
|
|
|
|
make
|
|
|
|
Flash the code happens in 2 steps. First the code itself gets flashed. Reset the module into bootloader
|
|
mode and enter 'make flash'.
|
|
|
|
The 2nd step is to pack the static files the webserver will serve and flash that. Reset the module into
|
|
bootloader mode again and enter `make htmlflash`.
|
|
|
|
You should have a working webserver now.
|
|
|
|
## WRITING CODE FOR THE WEBSERVER ##
|
|
|
|
See programming.md
|
|
|
|
## CHANGE FROM SDK 0.9.3 (and earlier) TO SDK 0.9.4 (and later): ##
|
|
Change all occurences of `espconn_sent(connData->conn, (uint8 *)buff, len);` to
|
|
`httpdSend(connData, buff, len)` please. The reason for this is that you can't do multiple
|
|
espconn_sent calls serially anymore, so httpd needs to buffer the writes now. This is only
|
|
needed in your own code; the code that comes with httpd already has this changed.
|
|
|
|
|
|
|