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esp-httpd README |
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This is a small but powerful webserver for ESP8266(EX) chips. Included is an example of how |
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to make a module that can have the AP it connects to configured over a webbrowser. |
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ABOUT THE WEBSERVER |
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The Good (aka: what's awesome) |
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- Supports multiple connections, for eg simultaneous html/css/js/images downloading |
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- Static files stored in flash, in an (optionally compressed) RO filesystem |
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- Pluggable using external cgi routines |
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- Simple template engine for mixed c and html things |
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The Bad (aka: what can be improved) |
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- Not built for speediness, although it's reasonable fast. |
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- Built according to what I remember of the HTTP protocol, not according to the |
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RFCs. Should work with most modern browsers, though. |
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- No support for authentication or https. |
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The Ugly (aka: bugs, misbehaviour) |
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- Possible buffer overflows (usually not remotely exploitable) due to no os_snprintf |
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This can be theoretically remedied by either Espressif including an os_snprintf in |
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their libs or by using some alternate printf lib, like elm-chans xprintf |
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ABOUT THE EXAMPLE |
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When you flash the example into an ESP8266(EX) module, you get a small webserver with a few example |
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pages. If you've already connected your module to your WLAN before, it'll keep those settings. When |
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you haven't or the settings are wrong, keep GPIO0 for >5 seconds. The module will reboot into |
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its STA+AP mode. Connect a computer to the newly formed access point and browse to |
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http://192.168.4.1/wifi in order to connect the module to your WiFi network. The example also |
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allows you to control a LED that's connected to GPIO2. |
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BUILDING EVERYTHING |
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For this, you need an environment that can compile ESP8266 firmware. Environments for this still |
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are in flux at the moment, but I'm using a crosstool-ng gcc setup combined with the libs & includes |
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from the ESP SDK and ESP VM. You probably also need an UNIX-slike system; I'm working on |
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Debian Linux myself. |
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To manage the paths to all this, you can source a small shell fragment into your current session. For |
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example, I source a file with these contents: |
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export PATH=${PWD}/crosstool-NG/builds/xtensa-lx106-elf/bin:$PATH |
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export XTENSA_TOOLS_ROOT=${PWD}/crosstool-NG/builds/xtensa-lx106-elf/bin |
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export SDK_BASE=${PWD}/esp_iot_sdk_v0.9.2/ |
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export SDK_EXTRA_INCLUDES=${PWD}/esp_iot_sdk_novm_unpacked/usr/xtensa/XtDevTools/install/builds/RC-2010.1-win32/lx106/xtensa-elf/include/ |
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export ESPTOOL=${PWD}/esptool/esptool.py |
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export ESPPORT=/dev/ttyUSB0 |
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Actual setup of the SDK and toolchain is out of the scope of this document, so I hope this helps you |
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enough to set up your own if you haven't already. |
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If you have that, you can clone out the source code: |
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git clone http://git.spritesserver.nl/esphttpd.git/ |
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This project makes use of heatshrink, which is a git submodule. To fetch the code: |
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cd esphttpd |
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git submodule init |
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git submodule update |
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Now, build the code: |
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make |
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Flash the code happens in 2 steps. First the code itself gets flashed. Reset the module into bootloader |
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mode and enter 'make flash'. You may want to reset and re-enter the bootloader halfway (at 'sleep 3') for |
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the 2nd part of this flash to work. |
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The 2nd step is to pack the static files the webserver will serve and flash that. Reset the module into |
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bootloader mode again and enter 'make htmlflash'. |
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You should have a working webserver now. |
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WRITING CODE FOR THE WEBSERVER |
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...errm... to be done. For now, look at the examples. Hey, you probably managed to find out how |
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the SDK works, this shouldn't be too hard :P |
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body { |
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background-color: #404040; |
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font-family: sans-serif; |
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} |
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#main { |
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background-color: #d0d0FF; |
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-moz-border-radius: 5px; |
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-webkit-border-radius: 5px; |
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border-radius: 5px; |
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border: 2px solid #000000; |
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width: 800px; |
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margin: 0 auto; |
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padding: 20px |
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} |
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body { |
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background-color: #404040; |
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font-family: sans-serif; |
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} |
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#main { |
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background-color: #d0d0FF; |
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-moz-border-radius: 5px; |
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-webkit-border-radius: 5px; |
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border-radius: 5px; |
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border: 2px solid #000000; |
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width: 800px; |
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margin: 0 auto; |
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padding: 20px |
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} |
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