Internet of Things Stack Exchange
Internet of Things Stack Exchange

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1500 questions
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A low cost alternative option for ZigBee stack in mesh network of sensors

We're in the step of making design decision for a wireless mesh network of individual sensors which is going to be low cost. At first research I decided to use MQTT for application layer and global ZigBee protocol stack for other layers beside an…
IMAN4K
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Does XMPP have a large overhead for IoT devices sending short, frequent messages?

I've been reading about XMPP as a potential communications protocol for IoT devices but, after reading one source, I'm unsure whether it's really an appropriate protocol if you're concerned about overhead for each message. This source…
Aurora0001
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Good microphone for whole room (without Internet)

I'm currently working on a smart home with voice recognition and I'm looking for a microphone that I could use for a whole room. What kind of microphone should I be looking for? What does the Amazon Echo and the Google Home thing use? The microphone…
Forivin
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Cannot get Google IoT Core to work

Has anyone gotten the example in their quickstart to work? They provide NodeJS code to connect to their MQTT bridge, but for me it does not work: [root@centos7 google-iot-mqtt]# node cloudiot_mqtt_example_nodejs.js \ > …
Gambit Support
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Sensors Communicating With the Pi, BLE / Wifi

I want to place a Pi 3 somewhere in my house and battery powered sensors. The Pi will read the inputs from e.g. the same level, one level above and the garden. So 1-2 regular brick walls in between and a range between 0-50m. I looked into different…
Andi Giga
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3 answers

MQTT broker accessible from outside without opening port in firewall?

I'd like my MQTT broker to be accessible from outside my home network, but I'm a bit reluctant to open a port in the firewall. And I'd like to avoid using my home IP. It's pretty convenient to have an unencrypted open broker at home, but that…
Thomas Jensen
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Is there a smart switch or plug that can remotely turn on another smart plug?

I have a lamp that is on one side of the room. I have a half-hot plug on the other. I'd like to flip the switch (that connects to the half-hot) and have that turn on the lamp. Can anyone recommend a smart plug or other thing that would allow me to…
Josh Long
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Can I publish multiple MQTT topics in a single request?

I've got a device with multiple sensors that publishes each sensor reading separately to topics like device1-id/sensor1-id = 10.2 device1-id/sensor2-id = 15.5 [...] We feed it to AWS IoT using Amazon AWS IoT SDK, i.e. mqtt_params.qos =…
MLu
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With a SmartThings system, what is the result of marking an alert as a false alarm?

We have a few SmartThings motion detectors and door sensors hooked up in our house. We don't have them connected to an alarm company or any sort of automatic emergency line but we do get notified when we have the house in away mode and one of the…
Catija
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Hacking the Amazon Dash button as SmartThings Arrival sensor (Mobile Phone)

I recently acquired the SmartThings Hub and trying to see if I can add some low cost IoT devices to my home. I suspect that the way SmartThings knows that I am home is by scanning for my phone's WiFi MAC address. If I turn off my phone's "scan…
some user
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Performance of MQTT over TLS vs. MQTT

While MQTT is quite versatile it is also not secured on itself. This is by design. According to Stanford-Clark, security was consciously left out of the protocol initially because he and Nipper knew security mechanisms could be wrapped around MQTT…
Helmar
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How to protect Raspberry Pi from attack in an IoT setup connected through a Broadband network?

The Setup: I have a Raspberry Pi as the master node which is connected to the internet through a broadband connection, the raspberry pi connects several sensors and other microcontrollers. The Pi is continuously connected to a server at a Cloud…
Shakti Phartiyal
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Can I create custom voice commands and responses for the Google Home?

I want to be able to create my very own custom voice commands and responses for my Google Home device. Is there anyway to do this?
Henry WH Hack v3.0
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How do I enable drop-in calling on Alexa?

I've configured my Echo and the associated Alexa app for calling and can call registered users. However, though I've read about the drop-in calling feature, I don't see any way to enable it. How do I enable and use drop-in?
glenviewjeff
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Power reduction for Raspberry Pi GPS/GSM tracker

I've recently built a fully functional IoT GPS/GSM tracker with a Pi Zero for a college project and now that it's finished and done with, I would like to minimize the current draw of the entire system as two 2500mAh batteries can only power it for…
sryan2580
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