Internet of Things Stack Exchange
Internet of Things Stack Exchange

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1500 questions
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2 answers

How can I make a topic/action to be allowed only to authorized users?

This is the scenario: I have a machine connected to a MQTT AWS-IoT Core broker. This machine is authorized with the AWS certificates to publish in the topic P/serialnb/deleterecords/record_id. This topic will delete a record in the database. In a…
IgorAlves
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Where is my sensor data being stored in the IoT Hub?

Context: I am sending temp/humidity data from an NCD.io sensor through a gateway device to Azure, where it is being stored in the IoT Hub, somewhere. Problem: Where is this data? I can access it through the device twin & also see it being sent via…
Andras M.
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MQTT subscriber connection

I understand an MQTT client publishes data to a topic after connect message. I am not sure how an MQTT client subscribing to a topic get updated when there is a publish to that topic. Is it the subscriber that has to initiate a connection and then…
Deepak Kumar
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Is there a difference between Google Nest Mini and Google Nest Mini 2nd gen?

I'm looking to dive into home automation starting from a Google Nest Mini device. I understand that there has been a Home Mini and then the second iteration was rebranded as Nest. But a retailer site recommended by Google India has two generations…
Qumber
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4
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What is necessary to employ a edge computing architecture

I've been reading about edge computing and use of nodes to decrease the distance between data and the server and most articles suggest the need of cloud to do edge computing. However, some papers that i've read for instance: AutoTriage - An Open…
clint southwood
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2 answers

Receiving doorbell notification on Zigbee or MQTT from an electro-mechanical ding-dong

I have a typical European failsafe bell transformer installed in my electrical box, wired to a classic ding-dong chime (works at 230v and 8v). I wonder if there is any component or a simple DIY solution that allows me to connect this legacy system…
retrography
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4
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Wheel skid detection

I am working on a project which sensed four speed by using hall sensor attached to wheel by using raspberry pi. I have wrote program for that only issue with that it gives fairly good results when wrote program for one sensor, and when using all…
Rakesh Choukse
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1 answer

LWM2M Bootstrap Factory versus Client

In the process of building a device that will utilise LWM2M protocol. Referring to the protocol specification here we have made a good stab at laying out the uplink and downlink packet specification. One of the remaining to do items is to figure…
scott_lotus
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Monitor Eufy Homebase from iPhone Apple Home?

I have a Eufy Homebase 2 with 6 EufyCam 2C and a wired doorbell connected. The Homebase is setup as a “room” in Apple HomeKit. The Homebase is Ethernet connected to Xfinity new router, with wifi enabled as backup, in case Ethernet is unplugged. xFi…
whakawaehere
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Project IoT backend for monitoring sensor data

I'm newbie to cloud-iot services. I was challenged by my lecturer to build a backend system where it can send sensor data to cloud, store it, and host a website page. Its about monitoring microclimate around a certain area (soil-moisture,…
achmad anshori
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2 answers

Decoupling data fetching from processing and publishing

I am working on a project that involves raspberry pi and the accelerometer sensor ADXL355. The raspberry's responsibility is to fetch the data from the sensor, filter only useful data and publish it to a thingsboard.io instance on the cloud. All the…
Riccardo
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Alarm system built with raspberry + sonoff rf bridge

I am developing a personal project at the end of which I should be able to create a homemade alarm system. All this should be protected against voltage drops/failures, the whole circuit will be inside a "box" that I will print with the 3d…
Mattia
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How could I use ESP32 for realtime wifi voice streaming?

I have an ESP32 with OV2640 camera and a GY-MAX4466 amplified electret microphone module and I would be able to connect it to ESP32 to stream voice and video in realtime when I connect to its IP, ideally at same time if hardware is capable enough or…
AndreaF
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4
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1 answer

Smart Locks with Alert feature

Are there any smart lock products that are capable of sending out alerts: Alert via text/email when lock is opened with code Alerts when lock is forcefully opened Alerts when lock becomes unreachable due to Wi-Fi or signals being jammed Please…
sob
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Mosquitto broker service not starting on Windows

I installed mosquitto for Windows, and ran the following command from command prompt as administrator: net start mosquitto I get the following message: The Mosquitto Broker service is starting. The Mosquitto Broker service could not be started. The…
Kirthi
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