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Routing Table
Display current routing table route -n Discover which interface will be used for a specific IP address ip route get 8.8.8.8 Setting wlan interfaces to be high priority for routing than eth0, if present sudo nano /etc/dhcpcd.conf Add these lines to the end (or add "metric" to the existing interface definitions if you've already specified […]
Detect RPi Hardware Version
Get Human Readable Hardware Details cat /proc/cpuinfo Get RPi Version Code Use the command: cat /proc/cpuinfo | grep 'Revision' | awk '{print $3}' The returned code can be looked up on the table at http://www.raspberrypi-spy.co.uk/2012/09/checking-your-raspberry-pi-board-version/ , copied below:
Running a command line tool on a child thread
The following example runs hcidump on a child thread. This happens to be a bluetooth bluez tool which continuously outputs events as it seens them. This code allows this to happen on a child thread with the output passed back to the main application thread using a named pipe. Create the pipe and the child thread process […]
.BlueZ general
BlueZ is the official Linux Bluetooth stack Documentation https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/doc https://docs.ubuntu.com/core/en/stacks/bluetooth/bluez/docs/index Tutorials http://people.csail.mit.edu/albert/bluez-intro/
USB OTG Port
Using the USB Port in slave device mode RPi boards that don't include a USB hub IC, such as the RPi Model A and RPi Compute Module, can take advantage of the USB OTG feature. https://gist.github.com/gbaman/50b6cca61dd1c3f88f41
.Compute Module 3 Overview
Technical Documentation The Compute Module datasheet is available here. Hardware In simple terms the RPi Compute Module is a Raspberry Pi 3 without PSU etc circuitry, connectors and with a 4GB Flash IC instead of the SD card socket. On the PCB: BCM2837 processor with 1Gbyte of RAM (as used on the Raspberry Pi 3) 4Gbyte eMMC Flash IC, […]
Win10 IoT Core on the Raspberry Pi
We have another mini web site with our resources on Win10 IoT Core for the Raspberry Pi which is at: https://ibex.tech/csharp/category/windows-10-iot-core A lot of our own use of the Raspberry Pi is for commercial projects and Windows IoT Core brings along several advantages in this area for us on some projects: Notable disadvantages of Windows IoT Core We still think Raspbian and […]
SHA256 hash
Generate a hash of a string, file, whatever. Salting your hash Combine your salt with what is being hashed (e.g. typically you do this with a password). SHA256 and other hash generation algorithms don't take salt but if you add the salt to the end of what is being hashed you will get a different result, hence […]
.Installing Openssl C++ Library
Installing the library sudo apt-get install libssl-dev Add the linker option for the library -lcrypto Documentation https://www.openssl.org/docs/manmaster/man3/ The documentation isn't always great and their search doesn't always work, but on the Libraries page search for the function name you want into on and it will be there