InstallationOfPicoweb < AFNOG

Tags: view all tags

---+ Installing the picoweb server

The description of picoweb on its git repository explains it as follows:

picoweb is a "micro" web micro-framework (thus, "pico-framework") for radically unbloated web applications using radically unbloated Python implementation, Pycopy, https://github.com/pfalcon/pycopy .

As you can see, it is designed to run of pycopy, a fork of standard !MicroPython, which we use on our ESP32 micro-controller. It depends on several packages, which are normally not part of the standard !MicroPython binary such that we either install these dependencies with upip or, better, freeze them into a custom !MicroPython binary.

picoweb depends on:
   * utemplate
   * uasyncio
   * pkg_resources
   * ulogging
In order to make these packages available I copy them into the _modules_ directory of the esp32 !MicroPython port:

<img alt="esp32Modules.png" height="73" src="%ATTACHURL%/esp32Modules.png" title="esp32Modules.png" width="777" />

utemplate can be found at https://github.com/pfalcon/utemplate

uasyncio is part of [[https://github.com/micropython/micropython-lib][micropython-lib ]]but need a small modification (the awritestr method must be added):

<img alt="uasyncioMod.png" height="247" src="%ATTACHURL%/uasyncioMod.png" title="uasyncioMod.png" width="682" />

_pkg_resources_ is the version found in micropython-lib

_ulogging_ is <i>logging, </i>found in micropython-lib, renamed _ulogging_

As you can see, we also copied picoweb itself into the modules directory. After compiling !MicroPython all these modules will be available for use.
---++ Running the WEB server

In the picoweb repository you will find a series of examples: In the picoweb directory you find _example_webapp.py_ and _example_webapp2.py_, where <i>example_webapp2.py </i>is essentially a subset of _example_webapp.py_. There is also an "<i>examples</i>" directory with mode examples.

In order to make this example run you have to
   * create a directory called templates on the ESP32 file system and copy squares.tpl into it
   * create the wifi_connect file (see the connect to !WiFi description in [[https://techtutorialsx.com/2017/09/01/esp32-micropython-http-webserver-with-picoweb][https://techtutorialsx.com/2017/09/01/esp32-micropython-http-webserver-with-picoweb) ]]
   * modify _yourNetworkName_ and <i>yourNetworkPassword </i>to adapt the script to your !WiFi SSID and password and upload the modified script to the ESP32
   * on the ESP32:<br />import wifi_connect<br />wifi_connect.connect()<br />will connect to your !WiFi network and print the IP address of the WEB server.
   * In example_webapp.py modify<br /><i>app = picoweb.WebApp(<b>__</b>name<b>__</b>, ROUTES)</i> to _app = picoweb.WebApp(None, ROUTES)_
   * add host="xxx.xxx.xxx.xxx" to app.run where xxx.xxx.xxx.xxx must be replaced by the IP address you get from wifi_connect. In may case:<br />app.run(debug=1,host="192.168.1.70")
   * copy _example_webapp_.py to the ESP32
   * on the ESP32:<br />import picoweb<br />will start the WEB server
A few screen dumps show the procedure:

First we run wifi_connect.connect() and check the IP address obtained:

<img alt="picowebRun.png" src="%ATTACHURL%/picowebRun.png" title="picowebRun.png" />

As ca be seen from the screen dump above, the IP address obtained is 192.168.1.70. This address is added to the app:run (debug=1) called as described above. When importing example_webapp the WEB server is started (see screen dump above). We can also see that port 8081 is used for the WEB server. This URL (192.168.1.70:8081) we enter into the WEB browser and get:

<img alt="picowebExApp.png" src="%ATTACHURL%/picowebExApp.png" title="picowebExApp.png" />

Clicking on <i>squares </i>will display the first 5 square numbers as calculated in templates/squares.tpl:

<img alt="squares.png" src="%ATTACHURL%/squares.png" title="squares.png" />

When clicking on source we see the source file of example_webapp:

<img alt="picowebPrintFile.png" src="%ATTACHURL%/picowebPrintFile.png" title="picowebPrintFile.png" />

This tells us that the WEB server is now up and running and we can now continue testing the examples in the _examples_ directory before putting our attention to the camera part of the project.

-- %USERSIG{UliRaich - 2020-01-24}%

---++ Comments

%COMMENT%

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who
png	esp32Modules.png	r1	manage	23.7 K	2020-01-24 - 14:32	UliRaich
png	picowebExApp.png	r1	manage	30.0 K	2020-01-25 - 10:10	UliRaich
png	picowebPrintFile.png	r1	manage	94.3 K	2020-01-25 - 10:03	UliRaich
png	picowebRun.png	r1	manage	48.7 K	2020-01-25 - 10:02	UliRaich
png	picowebStart.png	r1	manage	29.6 K	2020-01-25 - 10:02	UliRaich
png	squares.png	r1	manage	32.5 K	2020-01-25 - 10:03	UliRaich
png	uasyncioMod.png	r1	manage	36.4 K	2020-01-24 - 14:32	UliRaich
png	wifiConnect.png	r1	manage	45.9 K	2020-01-25 - 10:02	UliRaich

Topic revision: r3 - 2020-01-25 - UliRaich