I am making my home smart using esp32 and micropython. I have a Django project running on a server I have on my LAN and I want to send commands to my esp32 wirelessly through it. Maybe something like running a uvicorn server and a fastapi app and then sending messages to the uvicorn server endpoints and I have no idea how to do this.
You should probably use either Django Channels or django-websocket
But I'm not sure if websockets package is ported for micropython, so you might need to use plain socket
Or try something completely different. Physically connect the server and esp32 together (I have absolutely no idea about it)
My recommendation is the first option
Related
I have a shared web host running on Linux and cpanel , I was looking for a way to communicate from my website to a python console on my PC. I've seen that there's a "webhook listener" module for python which seems to be the solution to my problem but I don't know how to build a php webhook sender neither how to make python always listen to that webhook . How can I achieve this ?
I have a node.js server running on a Raspberry Pi 3 B+. (I'm using node because I need the capabilities of a bluetooth library that works well).
Once the node server picks up a message from a bluetooth device, I want it to fire off an event/command/call to a different python script running on the same device.
What is the best way to do this? I've looked into spawning child processes and running the script in them, but that seems messy... Additionally, should I set up a socket between them and stream data through it? I imagine this is done often, what is the consensus solution?
Running a child process is how you would run a python script. That's how you do it from nodejs or any other program (besides a python program).
There are dozens of options for communicating between the python script and the nodejs program. The simplest would be stdin/stdout which are automatically set up for you when you create the child process, but you could also give the nodejs app a local http server that the python script could communicate with or vice versa.
Or, set up a regular socket between the two.
If, as you now indicate in a comment, your python script is already running, then you may want to use a local http server in the nodejs app and the python script can just send an http request to that local http server whenever it has some data it wants to pass to the nodejs app. Or, if you primarily want data to flow the opposite direction, you can put the http server in the python app and have the nodejs server send data to the python app.
If you want good bidirectional capabilities, then you could also set up a socket.io connection between the two and then you can easily send messages either way at any time.
My requirement is to communicate socketio with nodejs server to Raspberry Pi running a local Python app. Please help me. I can find ways of communication with web app on google but is there any way to communicate with Python local app with above mentioned requirements.
It's unclear exactly which part you need help with. To make a socket.io connection work, you do the following:
Run a socket.io server on one of your two computers. Make sure it is listening on a known port (it can share a port with a web server if desired).
On the other computer, get a socket.io client library and use that to make a socket.io connection to the other computer.
Register message handlers on both computers for whatever custom messages you intend to send each way and write the code to process those incoming messages.
Write the code to send messages to the other computer at the appropriate time.
Socket.io client and server libraries exist for both node.js and python so you can either type of library for either type of system.
The important things to understand are that you must have a socket.io server up and running. The other endpoint then must connect to that server. Once the connection is up and running, you can then send message from either end to the other end.
For example, you could set up a socket.io server on node.js. Then, use a socket.io client library for python to make a socket.io connection to the node.js server. Then, once the connection is up and running, you are free to send messages from either end to the other and, if you have, message handlers listening for those specific messages, they will be received by the other end.
I am looking to host a basic Websocket server.
The code I want to see running is : FastFlicker
Do you know how and where I can host this application online?
PythonAnywhere dev here. Unfortunate we can't host websocket-based apps on our site right now. The toggle you spotted enables/disables websockets for our in-browser consoles, it's not related to running your own websocket server.
I've added an upvote for websockets to our own issue tracker, but for now you'll have to use a different service :-(
Your solution is OpenShift, even with the free plan you can host FastFlicker.
Click Add Application, choose the good cartridges (Python 2.7).
Then use your gitHub repo url to get the source.
Once the application is running, you need to SSH it to change the address and the port (see this Post).
To be able to ssh you need first to generate a ssh key and to add it in setting on the website
Ok, now kill all processes that uses your port. (lsof -i :8080)
Start your application and now it's working!
(It is in app-deployments/current/repo/ for me, then python FastFlicker.py &)
It is currently hosted here : ws://main-fastflicker.rhcloud.com:8000/
And to test it, you know you can use this generic client..
I am trying to setup Pusher to send messages from server to server. I do not need a client setup. I am trying to make the one server aware the other server is finished doing a particular task. Can anyone help with this?
Thanks
I work for Pusher. Have you tried using our server libraries? Some platforms have both a client (subscription) and server (publishing) library so you should be able to do what you want.