All Questions

3
votes
1answer
24 views

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 ...
1
vote
0answers
32 views

Create a smart environment [on hold]

I'm doing a pet project these days. Plan is to control room environment using an android application. So far I was able to found Sensibo to control AC and Philips hue bulb to change room light. Both ...
2
votes
1answer
35 views

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 ...
2
votes
0answers
20 views

Does SenML provide any fields that describe the sensor itself?

I am trying to look into the aspect of sending meaningful information from sensor nodes with the whole field of IoT. Here, meaningful being context-aware. If I send information from a temperature ...
-1
votes
0answers
25 views

How to get data from server in sim808 using MQTT protocol [closed]

I am trying to make a GPS/GPRS vehicle tracker. I can send data to server via broker using MQTT but I can't receive data from server using MQTT. How can I get data data from server in sim808 ?
4
votes
1answer
42 views

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 ...
3
votes
0answers
18 views

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 ...
2
votes
1answer
29 views

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 ...
3
votes
1answer
42 views

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 ...
3
votes
0answers
19 views

How to use Harmony activity to change mode on SmartThings?

I have an activity on Harmony (watch tv) that works fine. Turns on the tv, tunes in a channel, turns on the LED strip behind the tv. The problem is that the mode on SmartThings doesn’t change. So if ...
5
votes
0answers
24 views

TRÅDFRI lights and multiple swiches

I have 3 TRÅDFRI 30W drivers in my kitchen, and succeeded in pairing all of them to the same remote. However, if I pair a lamp to a 2nd remote, it stops responding to the first one. I was hoping to ...
1
vote
0answers
20 views

Read data from STM32 using UART ESP32 micropython \x00 error?

I am using a LOLIN32 lite (ESP32) to read data sent from a STM32F103 (black pill). The ESP32 is using micropython and the STM32 is programmed using CubeMX + Truestudio. When calling the uart.read() ...
1
vote
0answers
23 views

Proper way to add an Echo Dot 2 to my existing system

I have an Echo 2 paired with an Amazon Bluetooth receiver which in turn feeds an 70v Amp that plays throughout the home. This works. However, my wife has to constantly go from the Kitchen to the ...
1
vote
0answers
39 views

IoT hub on private network [closed]

I want to make a hub for file sharing in my private network like DC++. Is there any library which I can use or do I have to develop it from start. This can be developed for Arduino or Raspberry PI.
1
vote
0answers
35 views

Control GPIO of ESP32 using Bluetooth [closed]

I’m using ESP32 to control relays using MQTT ( both over Arduino and MicroPython ). For special cases, and not for everyday operation, I wish to control a specific GPIO over Bluetooth ( a reset irq)....
1
vote
2answers
53 views

Handle real time rule based events generated by IoT devices

I am working on IoT project in which I need to send alerts to users based on rules which already defined by user like if Temperature value matches certain condition then send alerts to users and their ...
4
votes
1answer
28 views

mosquitto_sub: command not found

I'm using a raspberry pi image that has the mosquitto broker installed. To troubleshoot, instruction was to run: pi@raspberrypi:/ $ mosquitto_sub -v -t "gateway/+/rx" However that resulted in: -...
2
votes
3answers
68 views

When should the data from IoT devices be sent to the cloud?

I am configuring a Sonar Distance sensor to send data to a cloud. But the problem for me now is: I do not know when to send the data to this cloud. As far as I know, I could send the data ...
1
vote
0answers
44 views

GPS/GSM Tracker not sending location [closed]

I bought GPS/GSM Tracker from eBay but it doesn't work and i can't get Location Steps I followed: I bought a new sim card with calls and data (checked that it working) I installed an app on my ...
4
votes
2answers
33 views

SBC similar to Banana/Raspberry Pi with USB comms

I’m looking forward to develop a handheld device that could communicate with PCs over WiFi network, Bluetooth and USB. I have looked at the forums about Rpi, and they say it does not support Usb ...
7
votes
1answer
63 views

How does an ESP8266 “advertise” it can handle Alexa “relative volume” commands

As I understand more I WILL edit this question. For now, I am guessing at what I need. To make it easier for people to help, I'll tell you the over all purpose: I have programmed an ESP8266 to ...
2
votes
2answers
43 views

Are there standard (topic) dictionaries for MQTT-capable devices/sensors?

We are thinking of using MQTT and I was wondering if there was a standard for topic dictionaries a sensors/devices - kind of like a MIB file for SNMP? Are these topic dictionaries published to a ...
5
votes
2answers
36 views

Can't connect IKEA TRÅDFRI driver to TRÅDFRI app

I have a 30W TRÅDFRI driver for the kitchen top lights, and I want to control them with a TRÅDFRI dimmer. That works like a charm. What doesn't work, is to add the TRÅDFRI driver to the TRÅDFRI app ...
7
votes
1answer
44 views

Is it necessary to create a x number of MQTT topics for x number of devices?

Currently in my project in which the controller(client) sends sensor data to the server and receives feedback from the server with some additional data, uses MQTT protocol for communication. It has 2 ...
2
votes
0answers
11 views

Force Echo 2 to Mono Output

My Echo (2nd Gen) is paired with a Bluetooth receiver which, in turn, feeds that signal to a 70 volt Mono amp that services the entire house, one speaker per room. Listening to the music, it sounds ...
2
votes
0answers
22 views

AWS Greengrass Raspberry Pi scanning for Bluetooth LE

I have a AWS Greengrass setup where I would like to have a Raspberry Pi constantly scanning for BLE devices and if anything is found publish a message via MQTT. I've gotten the script to work locally ...
1
vote
1answer
46 views

Which IoT devices should I pick for sensors data? [closed]

I'm currently deciding on several IoT devices such as Banana Pi M64 Odroid-C2 Beagleboard X15 Raspberry Pi Online Simulator for sensor data(not sure of any) The reason for choosing one of the IoT ...
4
votes
1answer
39 views

Understanding ZigBee Light Link protocol

I'm playing around with my Philips Hue and an AVR Raven but the packets displayed by Wireshark are not matching with the specification of Light Link v1. For example on scanning for lights, the device ...
2
votes
0answers
31 views

Most scalable LWM2M server implementation

What is the most scalable (considering the number of IoT devices managed) server side implementation of the OMA LWM2M protocol? Which language is it using? We can use Eclipse Leshan as a benchmark, ...
4
votes
0answers
41 views

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 ...
5
votes
1answer
29 views

Custom responses — Google Home

I have a a web server up that listens on a particular URL and returns a unique response based upon a bunch of criteria. For example (fake domain): myserver.com/cgi-bin/nextslot returns "Hello, ...
5
votes
1answer
35 views

Some type of movement sensor

I was wondering is there's a sensor or some type of sensor that would detect itself if it's been moved, say if I put the sensor in one end of the table and move it to the other end it will detect that ...
5
votes
3answers
90 views

Are there any smart electrical plugs with an open API?

My friend and I are in a university and we have been asked by the agriculture professor to create automated watering systems for plants. We want to have control over the grow lights so are there any ...
3
votes
1answer
32 views

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 ...
1
vote
0answers
41 views

Automation (Smart Home): General Information / Devices controller by WiFi [closed]

I would like to post this topic as general Q&A topic. I would like to start changing my home into a smart one. I am software developer, unfortunately I haven't got experience with Embedded (IoT) ...
6
votes
1answer
46 views

How can I view the website from the Maker Pro IoT Smoke Alarm?

https://maker.pro/arduino/projects/iot-smoke-alarm-arduino-esp8266-gas-sensor I'm a layman who wants to do this. Have completed it as shown in the link. But I don't know how to see the website and ...
2
votes
1answer
56 views

All possible Wired communication protocols that also transmit power supply in IoT [closed]

I am on the lookout for Wired networks deployed in Industrial and other IoT applicable sectors which use cables to transfer Power + Data. I am aware of: Power over Ethernet (PoE) IEEE standard ...
5
votes
0answers
33 views

Make ADT Door Sensors work with Ring security system?

Is there a way to modify ADT's Window and/or thin Door sensors in some way to work as door sensors for Ring's Home Security System? I am transitioning from an ADT security system to Ring's, but am ...
7
votes
1answer
38 views

Command not found while trying to flash Android Things

I'm having trouble installing Android Things on an SD card. The card itself seems fine, it's recognised by my Macbook Pro. I'm using the same command i used for the last pi I set up. Below is the ...
5
votes
2answers
54 views

How relevant is the energy consumption of IoT and RF home devices?

I am designing and building my own house. I am very interested in automatizing several devices as blinders and lights. In general, I am thinking in using Zigbee (Xiaomi and Aqara), RF and IR devices. ...
4
votes
1answer
41 views

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 ...
5
votes
3answers
83 views

Are there MQTT servers which allow for message log and retained messages TTL?

For my home setup, I use mosquitto as the MQTT broker. It works fine, delivering typical MQTT services. There are two functionalities which are missing: log all messages which were sent to the ...
2
votes
0answers
43 views

ESP8266-01: How to work with USB to ESP8266

I want to flash micropython on an ESP8266-01, using this wifi adaptor. Since I don't succeed in doing so (fail using esptool as I do with other ESP8266/ ESP32 I use), I'm asking for your assistance ...
3
votes
1answer
109 views

View the messages sent to the local Mosquitto server

How can I see the messages that are published to the Mosquitto broker which has been locally installed in Ubuntu? I have used Spring Integration and think it worked fine. I also tried commands in ...
5
votes
1answer
44 views

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 ...
3
votes
0answers
10 views

Can't Exclude or Reconnect Switch

I have a Smartthings V2 hub that supports my Z-Wave mesh. I have GE Dimmer Paddle Switch that stopped responding to my hub. I tried to exclude it (both just the item in question and then a general ...
5
votes
1answer
24 views

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 ...
4
votes
0answers
29 views

State of the Art for Alexa and Harmony with multiple hubs

There is a lot of information available about this generally, but the field is moving quickly and it's difficult to judge what information is dated. I have 3 harmony hubs: one for my theater room, ...
3
votes
1answer
37 views

Possibility of integrating secure elements with sensor networks?

Assume we need to do a type of digital signature such as ECDSA with sensors used in sensor networks. So, is there a secure and possible approach to store the keys in these sensors? For example, is ...
7
votes
1answer
33 views

How long should a FreeRTOS task be delayed in each loop?

I'm working on an AWS IoT project where the MQTT routines, callback lambdas and kind of everything else apart from initialisation are inside a task created by xTaskCreatePinnedToCore(). This task ...

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