i have just bought a raspberry pi 2 . i manged to set up a headless setup by setting up an ip in the commandline.txt file and then connect to it via putty.
In the /etc/network/interfaces i set up a static ip for the wifi connection along with the connection name and password. and the wifi works fine...
But the problem is the raspberry pi wont connect to wifi unless i connect the ethernet cable and make one ssh connection using putty..
If i boot using wifi only the green light will not turn up and i am not sure if the raspberry is booting or no...but when the ethernet is connected the gren light starts blinking and i can make an ssh connection.
can anyone help me with this.
I've dealt with a lot of pi wifi issues.
Adding "auto wlan0" to /etc/network/interfaces helped, but there were still instances where it didn't start up. I have the edimax ew-7811un usb wifi adapter. Can't remember where I took this script from to give credit.
I have cron running this script (wifi_check.sh) every five minutes:
keepalive_host='ip to ping here'
ping -q -c1 $keepalive_host >> /dev/null
if [ "$?" -ne "0" ]; then
ifdown wlan0
rmmod 8192cu
modprobe 8192cu
ifup wlan0
fi
You could repurpose the script and have something like this in crontab
#reboot /bin/sleep 30 ; /path/to/wifi_check.sh
Which should wait 30 seconds after boot, try to ping the server you specify, if it can: do nothing, if it can't: bring the wifi connection down and then try to bring it back up. I don't think the lines with 8192cu in them are necessary for your purposes unless that driver is also used by your wifi adapter.
Related
I have a raspberry pi but no external keyboard, mouse or ethernet cable to set it up - but I do have micro-sd card reader. Is there a way for me to just write my wireless internet config straight to the micro-sd card so the raspberry pi will be able to connect to the wifi, and then allow me to ssh in?
The micro-sd card already has Raspbian installed on it.
Sure.
Put the card in a drive and mount it.
Go to the partition called boot.
Create an empty file called ssh just using:
touch ssh # Works in Linux/macOS
type NUL >> ssh # Works in Windows
Create a file called wpa_supplicant.conf with your WiFi settings - be very sure that Windows hasn't added any .txt extension:
country=US
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
network={
ssid="NETWORK-NAME"
psk="NETWORK-PASSWORD"
}
Once it works, and you can ssh successfully into the Raspberry Pi, be sure to run:
sudo raspi-config
and permanently enable ssh for subsequent reboots.
Hello Friends,
I have a raspberry pi powered with Raspbian OS. I want to create a device which will perform some action like "open calculator ,open notepad,etc" on windows pc by commanding from a raspberry pi. So my problem is how to establish communication between raspberry pi and another windows pc ?
If i use VNC and SSH service, can i invoke other programs remotely on pc ?
You could use netcat, also known as nc which is included in most Linux distros and is available for Windows.
All you would do on the Windows box is get your IP address with:
ipconfig
Then you would start listening on some random port, say 5000 because that has no security restrictions and pass whatever arrives on that port to CMD.EXE for execution:
nc -l -p 5000 -e CMD.EXE
Then, on your Raspberry Pi, you would just do:
nc <WINDOWS_IP_ADDRESS> 5000
Now you can type Windows commands in your Rasperry Pi terminal for execution on the Windows box:
DIR
NOTEPAD
There is a "cheatsheet" here and I am using the technique in the section entitled "Backdoor Shells".
Note that this is a big security hole, but if it is just for yourself playing around on a private network, it is nice and simple.
I face a problem that I can ping to correct IP address, it have no loss. And also I use nmap ping the pi address, and I get it correctly. Then I using VNC viewer to try access to pi, but it always show up "The connection was refused by the host computer"
Did u all have any idea ?
Your problem indicates that your Raspberry Pi was reached by the connection attempt, but that no service was running on the relevant port and hence the connection was refused. I think, this is because the VNC service is not running on your Raspberry Pi.
Update 1
Raspbian now comes with the server by default thanks to a partnership with RealVNC, it just needs to be enabled.
Original
You must enable VNC Server on your Raspberry Pi using terminal
sudo apt-get update
sudo apt-get install realvnc-vnc-server
or you can also enable VNC Server on the command line using the sudo raspi-config command.
Advanced Options->VNC:Yes
Now you can connect to the VNC Server using a application such as VNC Viewer.
I have been having this issue with my Raspberry Pi Zero W even though it worked perfectly beforehand. This page https://www.realvnc.com/en/connect/docs/raspberry-pi.html should help.
I ran vncserver in a ssh window after verifying the interface settings in raspi-config.
It started the VNC Server and gave me the VNC Server catchphrase and the IP address with Port Number as shown in the photo linked below.
vncserver output
After running that command I was able to get the VNC Viewer on my windows machine to connect to the pi.
I then ran sudo systemctl enable vncserver-x11-serviced.service in the ssh window so that it would start automatically on subsequent reboots.
I've had this same problem but found a different reason. I found three ways to get around this error message.
Plug a mouse or keyboard into the Raspberry Pi zero, waking up the screen and the VNC connection.
Wait about 5 - 10 minutes which is the amount of time for the screen saver to kick in which seems to wake up VNC connection. but don't wait to long other wise run this command to get things going via ssh "systemctl start vncserver-x11-serviced.service".
I am hoping the new update they just published will fix this problem. I don't see this as much with the Raspi B3+ as with the Zero H.
The last was plug in both monitor and mouse and that for sure fixes the VNC issues but defeats the headless connection. It seems that running headless and the screen/saver are somehow related but just not smart enough to figure it out.
For people using newer version of Raspberry, VNC option is found under:
Config>Interface Options
pinging to any service will only tells us that whether the server is currently listening on that port or not. It will not tell you the possible result to connection request asked by client.
It seems that, you have installed VNC server but not started it properly. Use this command to start it...
# vncserver start
Also recheck the port number is correct or not.
With the Rasp Pi 4 - had connecting fail after rebooting both the server and client (both Rasp Pi 4s).
Took a while to realize that I have two clients: One named "VNC Client", the other "VNC Viewer for Google Chrome".
The former works, the latter doesn't.
There are Raspberry Pi 3 model B and MicroSD with NOOBS OS. Unfortunately I have not any display to get a direct access to NOOBS shell. So remote connection could be set via ssh. However my device does not have any IP-address. I read everywhere that the connection options must be set... via shell. But it's impossible for me!
How can I resolve this problem and get remote access to shell (or to desktop even)?
I ran into this a while ago, I started using PiBakery. It will write raspbian to the SD card and add a startup script to connect to the network and enable ssh. This way the first time you boot it up, its ready to go and you can connect via SSH.
When you set it up, it also allows you to set a static IP address so you know exactly where it is when it boots.
Enable SSH by placing a file named 'ssh', without any extension, onto the boot partition of the SD card.
Connect your device to your LAN using a wired connection.
From another computer on the network execute arp -a to view locally connected hosts and get your raspberry pi's IP address.
From there you should be able to SSH into your pi.
I have a Raspberry PI and a Wi-Pi wireless dongle.
I want to connect the PI to the computer using Remote Desktop Connection via wireless.
But I'm not sure how to get the IP of the Raspberry (without having access to the router), that I need to connect to it.
Now I get into router's page and see what IP it assigned to the pi, and use it to connect
But my goal is to be able to use it on the "field", using the phone's "internet sharing" option, to connect the PI and laptop to it, and then connect to pi from the laptop.
How can I get the IP address that the phone gave to the PI?
You could make your Raspberry Pi speak its IP-address, like described here.
First, install the espeak package:
$ sudo apt-get install espeak
Then, create a init script:
$ sudo vi /etc/init.d/sayIPbs
Paste the following content into it:
#! /bin/sh
# /etc/init.d/sayIPbs
## Some things that run always
# Carry out specific functions when asked to by the system
case "$1" in start)
echo "Starting script sayIPbs "
sleep 5
public=`curl ifconfig.me`
private=`hostname -I`
string="public address is $public and private address is $private"
echo $string | espeak -s 120 -v en-uk
sleep 2
echo $string | espeak -s 120 -v en-uk
;; stop)
echo "Stopping script sayIPbs"
;; *)
echo "Usage: /etc/init.d/sayIPbs {start|stop}"
exit 1
;;esac
exit 0
Finally, issue these commands:
$ cd /etc/init.d
$ sudo chmod a+x sayIPbs
$ sudo update-rc.d -f sayIPbs defaults
$ sudo reboot
Plug in some headphones and listen to the ip address which will be read out at the end of the boot process.
You should configure your raspy to have always the same ip address. Try to edit your interfaces.man file with nano or cat command with your own parameters as shown below. Remember to reboot after editing:
pi#raspberrypi ~ $ cat /etc/network/interfaces.man
auto lo
iface lo inet loopback
iface eth0 inet static
address 192.168.1.69
netmask 255.255.255.0
gateway 192.168.1.1
auto wlan0
allow-hotplug wlan0
iface wlan0 inet static
address 192.168.1.67
netmask 255.255.255.0
gateway 192.168.1.1
wpa-passphrase password
wpa-ssid myssid
I found that I can use nmap to "scan" the network for connected devices, and it will give me a list of devices and their assigned IP.
And since there's max 3 devices connected, the list is short and easy to read.
nmap -sP 192.168.1.1/24
Using just a button and an LED, I have written a script that gets the IP address of the Raspberry pi, and then blinks the LED repeatedly to show the IP address of the Raspberry Pi. I just count the blinks, note them down on paper, and then I have the IP address. It seems silly, but works with Just 2 I/O pins.
Use static IP on you pi by editing on /etc/network/interfaces. but, on the other way, you can also install network scanner on your phone.
Bit late answer, but I had similar issue intitially. Solved my problem in the following way:
Use the Unix terminal commands to identify the IP and the MAC address of wi-fi or ethernet port (ifconfig)
set up your router to always allocate a address to these respective network connections. use range outside what would be automatically generated with DHCP
Whenever you connect that raspberry Pi to your network it will automatically be allocated that address. I also put sticker on the pi with the mac and IP address. Especially useful if you are running it without screen and keyboard.