Internet of Things Stack Exchange
Internet of Things Stack Exchange

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1500 questions
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Advanced Universal Remote or basic home automation

I need an advice on sort of basic home automation. Let's say, I have 3 multimedia points in my home. 2 of them are TVs with attached recievers, players and game consoles, almost everything is network-attached. The other one is just a stereo reciever…
nightcat
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Why does MQTT Broker forget connection from SIM800 module?

I am working on SIM800 module and MQTT broker (Mosquitto) to design a kind of IoT device. When I try the MQTT server, I encountered this problem. The SIM800 connects MQTT server on TCP connection. You can see the code below about SIM800 TCP…
hakanuckus
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Accessing legacy device with RS232 over 4G Internet

I have an old device, that's located in a place where I don't have an easily accessible data connection. What I do today is I drive to where this device is located and plug a db9 rs232 serial connector to this device and turn on a laptop that has…
eri0o
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CCS811 eCO2 readings factors wrong

I have an ESP8266 (Wemos D1 mini pro v2.0.0) running esphome.io measuring CO2 with an Winsen MHZ-19B and an Adafruit AMS CCS811. I would like to use only the CCS811 to save power and space, however the CCS811 gives weird values So far, I've…
Tim
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Smart Door options

I'm looking for a ready-to-use Smart Door in a room. I want to control it via app (Bluetooth or direct wifi is ok) or by voice commands. It should have the following skills: open close lock unlock I tried googling this, but the problem is that I…
naXa stands with Ukraine
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LORA VS NRF24L01

I want to chooses between nrf24l01 and lora-ra02 for my smart home project The following parameters are very important to me distance range (covering an area of 400 square meters) Ability to cross hard objects life time Build quality
ali
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2-Way Switching with Alexa - how to get Alexa to toggle the switch regardless of it's state

I have Alexa controlling a smart relay, which is part of a two way circuit with a regular light switch. It works well bar one thing: if the relay is "off" and the manual switch is on, telling Alexa to turn the light off does not work; she says OK,…
Bevan
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How do IOT platforms like Blynk, ThingSpeak etc. communicate with hardware (e.g. ESP8266) without port forwarding?

I use port forwarding if I want to access my local server NodeMCU from internet. However if I use IOT platforms like Blynk, ThingSpeak... then I dont need to care about port forwarding. We can access our device easily using their auth token and URL…
Angom
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Installing apps on TCL Smart TV

I have this 43 inch UHD TCL 43R500 TV. But I am struggling to Install 3rd party apps on it. So it have a build in App Store TV4 but that doesn't have any good app. What I have tried is: To copy the .apk file in Pen Drive and try installing from…
Mikku
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Can Alexa be used to warn others if I become incapacitated?

I'm not elderly, but I live by myself and wonder if there is a way to set up Alexa or the like to send a text message & email to my relatives if I become incapacitated. Obvious signs of Incapacitation would be a 20-hour period of Not leaving the…
B Chin
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Wireless IoT Devices at mm-wave frequencies

The upcoming 5G can be beneficial for IoT in various aspects: higher data-rates low latency better utilization of bandwidth potential wireless power transfer/harvest Introduction of mm-waves (28 GHz and higher) would be a part of 5G standards.…
Anton
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What IoT services are available for free that does not have message rate limit?

let say my other device publishes messages every 10ms (trying to show a real time graph in mobile app) sending at slower rate i.e every 1s instead of 10ms would result to wrong output. Are there any other free services where in I can pub/sub…
SoraCode
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Play music through Sonos and Google Home at same time?

Is it possible to play music through both my Sonos speakers and Google Home at the same time? I have successfully set up Google Assistant on my Sonos and connected everything to the Google Home app, but can't seem to use all speakers at once.…
AleC
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Zigbee and supporting devices - UK

I'm reasonably new into the smart home stuff and IoT's, but after some research I look to use something like HomeAssistant or OpenHAB. From what I'm reading you need bridges for specific devices, unless they support Z-Wave or Zigbee (may well be…
Ricky
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MQTT-SN using any encryption?

Does MQTT-SN provide any encryption like AES-128 etc.? As I know, it's using a simple binary encryption but in my opinion this cannot be seen as a security feature. Many thanks in advance :)
Pepe Bellin
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