Internet of Things Stack Exchange
Internet of Things Stack Exchange

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1500 questions
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Why there is no LPWAN technology in HF or VHF band?

This is a question which I have been wondering ever since I started exploring LPWAN technologies. All the LPWAN technologies I have found (like SigFox, LoRa, Ingenu etc.) work in UHF band (300 - 3,000 MHz). E.g. LoRa and SigFox work in 868 MHz while…
shivams
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How will the Proxima I and II satellites use or test LoRa in space?

IoT Aukland Tweet references FleetSpace and launch of the Proxima I and II satellites. This put's the "W" in LoRaWan in a different perspective. How will these test LoRa in space? Is there any chance of linking to Earth (with a non-traditionally…
uhoh
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Lua for ESP32: How to obtain time from an NTP server or from time.is or?

I'm working with Lua on the ESP32. I see that contrary to the Lua implementation for the ESP8266, there is no NTP module (correct me if I am wrong). I have been looking at the net library, but am too stupid to put together something which would be…
Riteman
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"No connection" reported on Iris By Lowe's Android app for WIFI-enabled Whirlpool Water Softener (WHESCS)

Not sure what caused it, but my water softener stopped connecting to the Iris app recently. Has anyone found an easy solution?
ShieldOfSalvation
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MOXA Modbus with Raspberry Pi – Can't get slave to work

I have two Moxa modbuses that I have daisy-chained together, and then connected to my network's ethernet port. The modbuses are hooked up to a control board with LED lights for the coils and buttons for Digital Inputs. See the diagram below: I have…
user2868900
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Using RBP as a broker between door locks & web server

I am relatively new to RBP3 and what it can do, but Ill try to summarize what I want to do and maybe I can get some pointers in the right direction. So the idea is to have a web app running on a PHP server connected to a regular database. The RBP…
user2868900
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Can I use Xiaomi Smart Light Switch or other smart switches to control devices from other producers?

I'm trying to make my home smart and I am still in the first steps. I have some Yeelight smart bulbs and I want to add some smart plugs to control my old devices and some smart switches to control them all. The problem is that I cannot find a…
Ashkan S
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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 the mode is, for example, away, it will remain…
rlcabral
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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 central repository?
HiDefLoLife
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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, one for my living room, and one for my exercise…
tdimmig
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Using an iPhone as a source for a whole home audio system

Not sure this is the correct StackExchange site, but I have a whole home audio system in my home. I have 2 Sonos units connected to it as sources, and they work fine. Is there a way to use my iPhone as a remote source for a whole home setup? Can't…
John Livermore
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What is the difference between bandwidth consumption and speed of IoT protocols?

If IoT protocol has small bandwidth consumption, does that mean its speed is slower? I heard that MQTT is perfect for when we are restricted in bandwidth, but does that make it slower?
pivk95
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Remote com (serial) connection through cellular IoT

We need to be able to make a com (serial) connection remotely off site from PLC type device. We have completed a POC for sending some signals to Azure IoT utilizing a Siemens IoT2020 running linux with a NB cellular modem on the Cat-M1 network. The…
AntC
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Semantics in IoT and providing better context for data collection

I keep reading the following every now and then: By 2020, there will be almost 50 billion nodes connected to the Internet making IoT an important part of life (paraphrasing here) But even if I scale down to just 50 different sensor nodes in a…
Shan-Desai
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How to configure Wifi on a headless smart device?

I am looking to build a smart device with no external controls (no buttons, display, etc.) and am trying to figure out how to most easily allow a user to supply Wifi configuration to it. A specific device that comes to mind is the Chromecast; to…
cowdrool
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