Pypilot connexion

[OpenNav]

Hello everyone,
We’re a team of engineering students working on a marine navigation setup using Pypilot and OpenPlotter. We're trying to connect the two devices via Wi-Fi, but we've run into a problem we can’t solve.
Our goal is to have the Raspberry Pi Zero act as a Wi-Fi client, connecting to a Wi-Fi network created by the Raspberry Pi 4 (which is running OpenPlotter and acting as an access point).
Unfortunately, the Pi Zero fails to connect to the network hosted by the Pi 4.
We’ve used ARP scan tools to see connected devices, but the Pi Zero doesn’t show up at all.
Curiously, the Wi-Fi connection does work the other way around: if the Pi 4 is the client and the Pi Zero is the access point. But this setup doesn’t work for us — we need the Pi Zero to be the client so it can send sensor data correctly to OpenPlotter.
We read on the forums that changing the access point’s Wi-Fi channel (between 1 and 6) on the Pi 4 might help.
Does anyone know how to change the Wi-Fi channel for the Pi 4’s access point in OpenPlotter?

Any help or tips would be greatly appreciated — thanks in advance!

[Nik]

Pi Zero Wifi runs on 2.4Ghz only, so it won't be able to connect if Pi4 running AP on 5Ghz.
It will work fine the other way, which is what you're seeing.
Try forcing 2.4Ghz only on Pi4 AP

[vincenthure]

Hi,
My setup is 

• pypilot pizero
  
• headless serveur signalk (PI 4)
  
• headless serveur avnav (Pi 3)
  
• PI400 rasbian as client
  
• Wifi routeur Tplink
  

I connect all my devices with ethernet to the server.
The router give fixed Ip address to all devices.
To connect the pypilot to ethernet I use a Usb/ethernet adapteur.
To configure you need to install net-usb-4.9.22-piCore.tcz and add two lines in the bootlocal.sh

1. chpst -utc tce-load -i usb-serial-4.9.22-piCore > /dev/null
   
2. ifconfig eth0 192.168.1.3
   

Then everything work well without wifi, it's more robust (ip fixe)) and less latency.
The pypilot communicate with signalk protocol to server and can get data (wind, gps ....)

[OpenNav]

Pi Zero Wifi runs on 2.4Ghz only, so it won't be able to connect if Pi4 running AP on 5Ghz.
It will work fine the other way, which is what you're seeing.
Try forcing 2.4Ghz only on Pi4 AP

Thank you very much for your help, the problem is solved !