Andre Skarzynski m0jek

Citrix Workspace

In this manual I assume that we'll be using usb audio handset instead of hdmi audio output

Step

Check available architectures first

$ dpkg --print-architecture

Tutorial: MQTT and the retain flag

Assumptions and setup

This tutorial assumes:

a single computer (like a Raspberry Pi)
MQTT broker (like Mosquitto) running
the mosquitto_pub and mosquitto_sub commands are available.

Ubuntu 20.04 on a 15" Retina MacBook Pro (Mid-2014)

These are notes from my efforts to get Ubuntu 20.04 installed on my older MacBook Pro. I'm making this gist public in the hopes that it's helpful to others.

I did a Minimal install, but selected the option to install additional 3rd-party drivers.

Wifi doesn't work during the install (because it requires a 3rd-party driver), so you won't be able to choose to download updates while installing. No big deal, run a software update after the install.

The installer takes about 25 minutes to complete. Post-install, most things work. The only driver I had to manually install was for the FaceTime camera. More on that below.

Recipe: from MQTT to InfluxDB via Node-RED

2024-05-16 adds case study explaining how to extract values from topic strings, and how to specify the measurement name in the message payload provided to the "influxdb out" node.
2023-12-02 revise graphics to correspond with "influxdb out" node, and explain the pros and cons of InfluxDB 1.8 vs InfluxDB 2.

Introduction

Getting data produced by IoT sensors into a database is practically a mandatory step before effective visualisation (eg dashboards).

This recipe shows you how to get an MQTT payload into an InfluxDB database using three Node-RED nodes. It makes the following assumptions:

Environment

Using FreeBSD
Mountain Lion
VMware Fusion 5

Your VMware is installed at '/Applications/VMware Fusion.app'

Command Line tools are at '/Applications/VMware Fusion.app/Contents/Library'

especially vmrun

	__NOTOC__
	Notes on the Sinclair ZX Spectrum Next [[Retro Gaming]], [[ZX Spectrum]], [[Z80 Assembly Language]]

	==Next BASIC==
	===Editor===
	EXTEND MODE, CAPSLOCK - Start of program<br/>
	EXTEND MODE, GRAPHICS - End of program
	<pre>
	ERASE 100,200 ;Erase lines 100 to 200
	LINE 100,2 ;Renumbers lines from 100 in steps of 2, 100, 102, 104, 106...

	#!/usr/bin/python3
	#
	# load_agps_data
	#
	# proof of concept loading of agps data to quectel modem via AT commands

	from datetime import datetime, timezone
	import requests
	import serial