Tag: internet

Sharing Wi-Fi via the Ethernet port on Ubuntu

Your computer (wComputer) is connected to a Wi-Fi network and you want to connect another computer into Wi-Fi network to share the internet connection but this computer (lComputer) doesn’t have a Wi-Fi adapter.

What it has is an Ethernet port and therefore, the wComputer with the Wi-Fi connection can share that network over its Ethernet port to the lComputer.

I am using Ubuntu on the wComputer and windows on the lComputer.

  • Type nm-connection-editor in your terminal.
  • Add a shared network connection by pressing the Add button.
  • Choose Ethernet from the list and press Create.
create a new ethernet connection
  • Click IPv4 Settings in the left.
  • Choose Shared to other computers by clicking the Method drop-down menu.
  • Enter a new name like wifishare as the Connection name at the top
rename it to wifishare (optional) and select share to other computers in IPv4

now, I connected the lComputer with the wComputer using a cable and rebooted the wComputer, i think restarting the networking service should also do the magic.

lComputer will get a IPv4 address from the wComputer 10.42.0.24, which is probably the default on Ubuntu.

[1] https://www.cesariogarcia.com/?p=611

Compiling Contiki for CC1350

Setup:

  • macOS 10.13.5
  • VM – VirtualBox
  • Guest OS: Ubuntu 16.04

Setup Contiki on the local machine:

Install the following packages. you might need sudo right.

# sudo apt-get remove gcc-arm-none-eabi gdb-arm-none-eabi binutils-arm-none-eabi
# sudo add-apt-repository http://ppa:team-gcc-arm-embedded/ppa
# sudo apt-get update

Compile Contiki hello-world for Native:

Native means that your code will compile and run directly on your host PC.
for me, it will run on the Ubuntu 16.04 OS on the VM.

cd into your development folder.

# git clone https://github.com/contiki-os/contiki
# cd contiki/examples/hello-world
# make TARGET=native
mkdir obj_native
  CC        ../../core/ctk/ctk-conio.c
  CC        ../../platform/native/./contiki-main.c
  CC        ../../platform/native/./clock.c
  CC        ../../core/dev/leds.c
### output truncated ###
  AR        contiki-native.a
  CC        hello-world.c
  LD        hello-world.native
rm hello-world.co

The target command tells the compiler to compile for the current system.
This is what is later changed for cross compiling to our target platform.

Type the following command to run the hello-world program.

# ./hello-world.native
Contiki-3.x-3343-gbc2e445 started with IPV6, RPL
Rime started with address 1.2.3.4.5.6.7.8
MAC nullmac RDC nullrdc NETWORK sicslowpan
Tentative link-local IPv6 address fe80:0000:0000:0000:0302:0304:0506:0708
Hello, world

if this is how it worked! your compilation worked!

Compiling Contiki-OS for CC13xx

The only thing to be changed is the target. make clean is an important step.

make clean
make TARGET=srf06-cc26xx BOARD=sensortag/cc1350

this says the compilation works if you see the following:

CC ../../cpu/cc26xx-cc13xx/lib/cc13xxware/startup_files/ccfg.c
CC ../../cpu/cc26xx-cc13xx/./ieee-addr.c
AR contiki-srf06-cc26xx.a
CC ../../cpu/cc26xx-cc13xx/./fault-handlers.c
CC ../../cpu/cc26xx-cc13xx/lib/cc13xxware/startup_files/startup_gcc.c
CC hello-world.c
LD hello-world.elf
arm-none-eabi-objcopy -O ihex hello-world.elf hello-world.i16hex
srec_cat hello-world.i16hex -intel -o hello-world.hex -intel
arm-none-eabi-objcopy -O binary --gap-fill 0xff hello-world.elf hello-world.bin
cp hello-world.elf hello-world.srf06-cc26xx
rm hello-world.i16hex hello-world.co obj_srf06-cc26xx/fault-handlers.o obj_srf06-cc26xx/startup_gcc.o

This error absolutely means that the installation of the compiler for cross-compilation wasn’t successful.

/bin/sh: 1: arm-none-eabi-gcc: not found

Next step would be to compile with contiki-ng since, there is active development is happening there and to base all developments to that repo.

# git clone https://github.com/contiki-ng/contiki-ng
# cd contiki-ng
# git submodule update --init --recursive

navigate to the hello-world example and hit the following

# make clean make TARGET=srf06-cc26xx BOARD=sensortag/cc1350

References:

[1] https://sunmaysky.blogspot.com/2015/08/setup-6lbr-to-run-6lowpan-with-cc2531.html

[2]https://sunmaysky.blogspot.com/2015/09/contiki-subg-hz-6lowpan-on-cc1350.html

WiFi Positioning System – Using Python and Google Geolocation API

I consider there is these following steps involved for such a program.

I will keep this as a documentation as well as a progress report to keep track of the project.

  1. Reading all the required information
    1. Reading SSID in MAC
      • Using Airport Shell command
      • Here is how it should look: [viraldownloader id=180]
    2. Reading SSID in Linux (Ubuntu), Windows
      • identify shell command for linux/Ubuntu
      • identify shell command for windows
  2. Parsing them in JSON format
    1. Parsing information into required information into prescribed format
  3. CURL and Get the Location information in JSON
  4. Parse it and display on google
  5. Building a GUI

Here is the gitHub repository for the project that I am working on.

https://github.com/akrv/pyWPSLocalisation

Feel free to contribute/contact it is interesting for you aswin[at]southpaw.in