I have been trying STM32 Over the Air upgrade using Ethernet connection. I have used sockets to connect my Ethernet Wiznet W5500 to the internet successfully.
The problem that I am not getting how to read the file content from any website after being connected.
Anyone have done that before?
Related
I am using raspberry pi
I am using signalR to send data to my client browser.
If my raspberry is on the same network via Ethernet or WiFi then I can get it to work.
If I now disconnect Ethernet and WiFi and switch on my gsm module I get assigned a dhcp address like 10.126.88.4 etc
If I now go to a client browser and type that ip address in the browser it will eventually time-out and upon investigation I find the raspberry pi has been assigned a different IP address.
This happens every time I refresh the browser.
After googling I find that it is the network providers doing this to stop the gsm being used as a server gateway.
One of the solutions is to use a proxy server but I could potentially have a lot of data passing through and
my initial idea was to have client browser talking directly to the raspberry pi device using gsm and thus not going through my own server.
Is there a solution to my predicament?
I am trying to establish a serial connection between the RPI3 and an Arduino. Because that wasn't working I connected a USB to TTY cable from my laptop to the Rx/Tx pins of RPI. I was eventually able to use PuTTy to connect to it.
I am running Android Things on the RPI and the android code I have running is supposed to be a loopback (reading from UART and writing back what was read).
Here is where I am confused....
When PuTTy connected I was presented with a command line console on the RPI.
How do I get the Rx/Tx pins on the RPI to just be serial connections into and from my application and NOT a way to log into the console?
Is that a bad idea? I suppose if I ever needed to log into the RPI this would make it more difficult...
I figured out what I was doing wrong...
When following the setup directions at the below site I was using the Bluetooth mode instead of the Application mode. When I followed the directions for Application mode I was able to start using UART0 for serial comms
Set the console attribute to the following in cmdline.txt:
console=tty0
Add the following line in config.txt:
dtoverlay=pi3-disable-bt
Remove the following lines from config.txt:
enabled_uart=1
core_freq=400
https://developer.android.com/things/hardware/raspberrypi.html#disabling_the_console
Beginning with Developer Preview 3, in which USB-Serial devices support added, You can use external USB-UART dongles like this instead of UART of Raspberry Pi 3.
I have install OS in SD card and after installation OS is boot successfully but display below message every time:
http://prntscr.com/fbhj3j
I did not connect LAN cable raspberry board.
If this issue is because I cannot connect internet using wifi? If yes, how?
You need to continue to follow the instructions here: https://developer.android.com/things/hardware/raspberrypi.html
A Raspberry Pi will not connect to the Wifi if you have not first connected to an ethernet lan cable first. (Once you are connected via ethernet you then can configure the wifi and finally remove the ethernet cable).
So you are up to this step:
Connect an Ethernet cable to your local network.
When this is connected, your screen will show the IP address of the Raspberyy Pi on your local network
how do i connect my raspberry pi to WIFI without ethernet cable. I have a wifi dongle or usb connected to my pi but the internet still doesnt work unless i connect a ethernet canble. can someone please help me out
You can setup your wi-fi via the command line, see a detailed guide on the official site:
https://www.raspberrypi.org/documentation/configuration/wireless/wireless-cli.md
Another option is to use the PIXEL desktop:
https://www.raspberrypi.org/documentation/configuration/wireless/pixel-desktop.md
We have a shared PC in our LAB, connected to a Vector Network Analyzer (VNA). The PC communicates with the VNA through GPIB port, using Matlab functions. For my work, i need to acquire real-time data from the VNA into my own PC, which is few meters away from the VNA PC. I dont want to have wireless solutions due to the interference that might happen. I intend to buy a USB data transfer cable to connect the Matlab. But i couldn't find in google any similar idea to do so. I was wondering is such a solution practical? Does anybody has the same experience? And will be any problem regarding the drivers?
in USB bus systems there can only be one USB host all other devices are in USB device mode.in most cases the USB controllers of PCs are not capable of USB device mode, they all want to be USB host. in other bus systems like I2C this is called master-slave architecture
if you are lucky one of your PCs can be set to device mode and in this case this will work but your chances are very slim (because of the problem with the USB host and USB device mode)
https://unix.stackexchange.com/questions/195765/is-usb-to-usb-data-transfer-between-two-linux-oses-possible
a better solution would be to use ethernet
there are also modules in MATLAB for real-time communication over ethernet (Real-Time Transmit and Receive over Ethernet)
if your pcs have unused ethernet ports use an ethernet crossover cable (http://en.wikipedia.org/wiki/Ethernet_crossover_cable) and connect the pcs (i.e. http://www.ccm.net/faq/6340-connect-pcs-using-a-crossover-ethernet-cable)
else use an ethernet switch (or hub) to establish the ethernet communication between the pcs
beside MATLAB for communication you can use i.e. ssh or install a vnc server on one of the machines and remote-control it with a vnc client on the other,...
USB
with USB-to-ethernet adapters (ebay,...) you can use ethernet over usb when connecting the usb-to-ethernet adapters via a ethernet crossover cable
another possibility is to use two USB-to-serial adapters and connect them with a RS-232 crossover cable and then use RS-232 protocol for communication (putty,...)