There are many quirks with creating the virtual interface ap0. You have to follow exactly a sequence, otherwise it won't work. If other applications bind to the wifi port it cannot be set.
create a virtual interface ap0 for the access point
start access point daemon hostapd using interface ap0
start wpa_supplicant for wifi client using interface wlan0
Some years later I have found new possibilities using systemd-networkd to create a WiFi router/repeater. The built-in WiFi device of a Raspberry Pi is capable to create an access point together with a client connection simultaneously as uplink to another WiFi internet router. How to do it you can look at Access point as WiFi router/repeater, optional with ...
The setting on the RasPi is OK so far. You do not need iptables rules
pi@raspberrypi:~ $ sudo iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT
pi@raspberrypi:~ $ sudo iptables -A FORWARD -i eth0 -o wlan0 -j ACCEPT
but they don't hurt. It's all ACCEPTed in the FORWARD chain. But I would not set more than needed.
The quirks is on the PLC. It receives packages ...
On a Raspberry Pi 4 only Raspbian Buster is running out of the box. On a Buster installation you will find the firmware with:
rpi ~$ apt list *raspberrypi*
libraspberrypi-bin/testing,now 1.20200212-1 armhf [installed]
libraspberrypi-dev/testing,now 1.20200212-1 armhf [installed]
libraspberrypi-doc/testing,now 1.20200212-1 armhf [installed]
You want to have a client WiFi connection to an uplink access point. The problem is, that a Raspberry Pi does not support bridging a WiFi interface used for a client connection due to a hardware limitation. For further information about this look at Raspberry Pi WiFi to Ethernet Bridge for a server?.
But as noted there you can use proxy arp as a workaround ...
If you want to sniff your neighbors WiFi, the wireless chip must support monitor mode. The built-in WiFi on a Raspberry Pi does not support it. So you are without luck. You can check it with:
rpi ~$ iw list
and look for Supported interface modes: in the longish output. Have a look at Enable monitor mode for further information about this.
AFAIK the WiFi adapter on RPi 3 is not on USB bus but on SDIO bus, same as the SD card. Therefore the earliest dmesg message proving its presence is
mmc1: new high speed SDIO card at address 0001
One of the possible failure messages is
mmc1: error -110 whilst initialising SDIO card
If you get this message, or there is no mention of mmc1 at all, this ...
It's weird. Sounds like HDMI signals conflicting with Wifi signals, however, change the cable to another one (better, if it has a shield it'd be better.) and add an external wifi dongle.
If you change the cable, maybe you would realize that it's ok with "1920 x 1080" and it's not with "1280 x 720".
The list below can help you.
It seems that you only found setups, using routing. But it is no problem to setup the WiFi access point on the RasPi to be on the same internal subnet as the internet router. You have to bridge the wired connection to the router on eth0 with the wlan0 interface of the access point. This way you are even on the same broadcast domain as the router, so your ...
adding an IP to br0 solved this problem for me. thanks.
raspbian 10.3: /etc/network/interfaces
iface br0 inet static
bridge_ports eth0 wlan0
From the hostapd.conf file :
# Maximum number of stations allowed in station table. New stations will be
# rejected after the station table is full. IEEE 802.11 has a limit of 2007
# different association IDs, so this number should not be larger than that.
# (default: 2007)
With setting up an Access point as WiFi router/repeater, optional with bridge I run into the same problem with the common channel of ap0 and wlan0 and could not get it to run with wpa_supplicant for the access point. So I decided to use hostapd. It is able to follow the channel for ap0 from wlan0 automagically. You may have a look at Step 2: install hostapd ...
You can use Ubiquiti AirMAX products to easily get a connection across 1 mile, if you have line-of-sight.
Even the cheap Nanostation units would do it. I've used these on multiple setups with good success.
Then, you could install wireless repeaters in the middle of the field, to give you all-around coverage.
Note that you'll need reliable power in the ...
You have to configure the RasPi as a simple router. With tethering you should always get an ethernet interface. For example with USB-Tethering you get the interface usb0 out of the box with Raspbian. You can use this interface like any other network interface. I use systemd-networkd to configure networking because it makes things easier.
Just follow to Use ...
Probably the most popular related project with GUI is Wireshark
Wireshark is the world’s foremost and widely-used network protocol
analyzer. It lets you see what’s happening on your network at a
microscopic level and is the de facto (and often de jure) standard
across many commercial and non-profit enterprises, government
agencies, and educational ...
The dmesg log shows that the driver is loaded for a BCM4345/6 chip. It may be worth you checking this on your board as the RPT/RPF have not stated what this chip is as far as I know (and it's not in the certification documentation).
This note from Kali Linux here states that you can get:
on-board wifi monitor mode & frame injection support
I would put an ESP32 or similar in between to Pi and HX711.
You could build some functions (e.g. tare) into the Arduino so it closer to the weigh scales than the Pi so you can check the device. Note load cells can drift over time if constantly under load so you may need to introduce check and calibration processes.
The HX711 has an Arduino library that ...
Based on the notion that WiFi is available and this is a very light use-case, you could get away with a Pi Zero W (the 'W' is WiFi version).
The major elements of this are:
Acquire & assemble hardware
Download Raspberry Pi OS (Lite)
Copy OS image to microSD card
Configure to allow SSH access and also WiFi configuration
Create camera capture job (via ...
I think the issue is that you are asking for a mile or more of range and that seriously limits the options here. You will need a radio service that has that sort of capability. Assuming you're looking at using this unlicensed, that rules out many options open to licensed business users or licensed radio amateurs which could easily reach a mile.
FRS or ...
I think something like this should work.
All this commands can be in an uniq bash shell script using sudo for execution :
# 1- Connect your client
cat << EOF > /etc/wpa_supplicant_ap0.conf
How can Rpi talk to Arduino in RF?
/ to continue, ...
For poor IoT hobbyists like me, I would suggest to start with:
(1) BLE (2.4GHz),
(2) NFC (13.56MHz), and
(3) 5G (452.5 ~ 467.5MHz, 700MHz~ 2.2GHz)
Above three are wild choices.
For newbies, I would eliminate
(1) BLE, because RPi4B buster BLE still have teething ...
I had the same problem. by mistake, you set the config file /etc/hostapd/hostapd.conf to DAEMON_OPTS instead of DAEMON_CONF.
1. Add DAEMON_CONF="/etc/hostapd/hostapd.conf" to /etc/default/hostapd.
2. Comment DAEMON_OPTS= ... or remove all the line.
3. service hostapd restart.
Another possibility is about "Wifi Country Code". Run raspi-conf and go to 4 ...
At first, make sure you have configured the raspberry pi as a Wifi hotspot and check it on other devices. If other devices can connect to the AP of your raspberry pi and they get an IP address, follow this answer.
The apache.conf is the problem. Take a look at how the Splash page of a captive portal works!
Every operating system has its own different way ...
Get a second RPi connected to the display: that will be your "wireless" part. You can remotely access a display using X server protocol. This is typically done from an SSH session (see ssh -Y) or a reverse SSH tunnel, which will handle obscure X authentication mechanisms for you.
If you want to have control on SPI level, write your own protocol which allows ...
I fixed the issue by having the computer that I was trying to ping the pi with plug into the router directly instead of having it plugged into a network switch that was plugged into the router.
As for the device being stuck in DORMANT mode, I fixed that using the following command: ip link set wlan0 mode default
Because you started with a fresh flashed Raspbian Buster image so just enable WiFi as described at Wireless connectivity from the Raspberry Pi Foundation. If this doesn't work then you should have a look at the hardware of your RasPi or at the device from which you try to connect.
Prevent dhcpcd from configuring an interface in How to set up networking/WiFi shows how to stop dhcpcd configuring an interface.
NOTE Predictable Network Interface Names is recommended if multiple WiFi interfaces are in use.
Turns out I can simply access my webserver through the wlan0 interface with a little configuration on the access point. I don't quite remember what it was exactly as I tried multiple things, but I believe the solution was to remove denyinterfaces wlan from /etc/dhcpcd.conf. Then you use ifconfig to find out what ip address wlan0 uses, and you use it to ...
I would say ifplugd is the right daemon to solve your problem. But the Debian package for it uses old style ifupdown managed with /etc/network/interfaces. Since Raspbian Stretch dhcpcd is used for networking instead of ifupdown so support for ifplugd is also "deprecated". I think to use a complete outdated Raspbian version Jessie only for this issue is not a ...