Internet of Things Stack Exchange
Internet of Things Stack Exchange

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How does LoRa based geolocation work? How does it measure distance?

The speaker in the video Richard Lansdowne - LoRa Geolocation mentions straight-off that he won't be quoting an accuracy for geolocation using LoRa, and it's of course not the ideal signal you would use. A comment below the video says: Excellent…
uhoh
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Standard message structure for communication in HTTP

My question might be a little strange but I can't find any answer to it. I'm designing a simple IoT system that has some devices as a client and a server that controls these clients like reading sensors, sending commands, etc. In the communication…
Masoud Rahimi
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Entropy depletion in /dev/random on Beaglebone

I have a Beagleblone Black with an ARMv7 SoC. /proc/cpuinfo says the hardware is Generic AM33XX. It is running Debian and the 4.1.15-ti-rt-r40 kernel. I run a lot of stress tests as part of my testing regime. The Beagleboard is suffering entropy…
jww
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How to decide how to select an endpoint device

This question is intentionally rather open ended, and potentially opinion based, but it is intended to act as a catch-all for the questions on how to select a device for a sensor/endpoint. Any question which intends to be more specific would need to…
Sean Houlihane
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MicroPython - ESP8266 using WebRepl

I'm trying to use WebRepl on an ESP8266 port. Micropython was install OK. @repl : import webrepl-setup to initiate WebRepl. OK reboot. connect to AP of ESP8266 port - OK using downloaded webrepl.html file to access. OK connect to 192.168.4.1 ,…
guyd
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Can I use MatLab code in esp32?

We've some method to run the MatLab code in esp8266 microcontroller. We can manipulate Arduino pins using Simulink in MatLab. Can we do the same with an esp32 microcontroller as their code can be executed in Arduino IDE? In Arduino, we are only…
Arshdeep Singh
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AWS IoT certificate rejection

I've been trying to configure AWS IoT to communicate over MQTT using TLS for days on a D1 Mini board and have been running into a road block with authentication. I've used several AWS IoT Arduino libraries such as this one that hardcodes or uses…
Thibaut Hardin
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How to use dedicated cryptochips

I have a chip that needs to send arbitrary data to a server that I do not control. We're using mbed TLS at the moment, however the binary is quite large. So, we introduced a dedicated cryptographic chip on the PCB. This means that encryption and key…
Gregory
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How to setup local MQTT in Bridge REMAP remote topics

I am trying to setup MQTT bridge, where I want to publish all local topic to remote, but subscribe only certain remote topic which matches wild card and remap to local broker Here is the config topic # out 2 "" UP/site1/ topic DOWN/site1/# in 2…
rp346
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Using Raspberry Pi as USB bridge

I wanted to use my Raspberry Pi as USB bridge between multiple devices. We can assume that I want to connect my iPad which has POS software on it to my thermal printer. Most of star or Epson thermal printers can be recognized by iOS since they have…
fafa92
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Looking for IoT (or general) platforms which can trigger actuators

I'm relatively new to working on IoT, so I'm also a bit ignorant on the subject. I have a system, like most IoT systems, that consists of several sensors and actuators on a field. Simplifying, these sensors send their data to a database through a…
Diogo Rosado
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node-red - Replicating message flows per MQTT subscribing client

I want a MQTT subscription client to consume messages from AWS IoT broker. On AWS IoT broker, wild card topic subscription is not supported. In our use case, we know the upper bound of number of possible subscriptions. We also know, when a device is…
cogitoergosum
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Can I use Android Things to detect a doorbell press via an RF Transmitter/Receiver pair?

I've bought a pair of 433MHz RF Tx Rx modules. I've been struggling to find any information on getting them working on Android Things (Raspberry Pi). My goal is to set up AT to detect the RF transmission upon a doorbell press and then notify my…
jampez77
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Efficient Server- and Protocol structure for raspberry, smartphone and 3rd-party-device network

I am new to this forum and this field. I am looking forward to good criticism and tutorials/links/instructing suggestions to build a nice system with as less effort as possible while achieving all things I want to have. The Situation I am right now…
ReneL
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Is there a Linux distro (à la Open/DD WRT) for smart speakers?

Smart speakers like Amazon Echo or Google Home are starting to become common. Is there a community effort to create an open source Linux firmware that can be run on them? I am thinking to something like Openwrt and Dd-wrt for routers. A Google…
Federico Poloni
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