Internet of Things Stack Exchange
Internet of Things Stack Exchange

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How do consumer IoT devices typically enable Internet connection?

As far as I know there are 2 general methods for enabling remote (Internet, not LAN) access to IoT devices: Via a server that the device polls periodically (e.g. MQTT) Direct remote access I'm assuming the second method is not straight forward as…
Perspectivus
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Can ZigBee be used without a hub?

Can you connect devices without a hub? For example. ZigBee A will talk to ZigBee B and C What I see in the market is they have a hub for the devices—a ZigBee wall switch will have a ZigBee hub. Similarly can the hub be used to work with other ZigBee…
Lester T.
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Should I use a different password on each IoT device?

According to cmswire.com, one of the major security risks with the Internet of Things is Insufficient Authentication/Authorization. When it comes to the Internet of Things, should I use a different password for each of my devices, or is it okay to…
anonymous2
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What is the power implication of encrypting my sensor traffic?

Considering a typical type of application, a battery powered sensor taking readings (32 bit value) every 10 minutes, what is the likely impact on battery life if I choose a simple un-encrypted on-air protocol, compared with an encrypted…
Sean Houlihane
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Is Bluetooth 3.0 suitable for a single-master multiple-slave network?

I have a data logger board with a SIM808 on it. It has Bluetooth 3.0 capability by the SIM808. The board itself implements a battery management system, capable of performing weight, humidity and temperature measurements and also can detect device…
Bence Kaulics
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Are there MQTT brokers that persist QoS 1/2 messages to disk?

As of now the EMQ (Erlang MQTT Broker) does not seem to persist QoS 1/2 messages to disk: How does EMQ persist QoS 1/2 messages? So in case of an unexpected server reboot, memory limits, or other event messages might be lost despite QoS 1/2 level…
Ghanima
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Mosquitto on Raspberry Pi refuses connection after changing log settings

In my ongoing endeavors to get my Raspberry Pi to command my stuff I set up a Mosquitto MQTT broker. In the base settings everything went reasonably fine. I could post test messages with the publish command and receive them with the subscribe…
Helmar
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How to efficiently control my dumb TV via Alexa?

I have a more or less dumb TV (Toshiba 42SL863G) and home cinema system (LG HX806SG) which I want to control via Alexa voice command. At least switch them on and change into either TV or home cinema configuration. Unfortunately that seems to mean…
Helmar
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What happens when there is not any subscriber to a topic in MQTT?

The situation is the following: There is a client, a publisher, it is not subscribed to any topic. This client has a single topic of its own, and publishes data reguraly to it. But there are not any other clients that are subscribed to this…
Bence Kaulics
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Why are Zigbee hardware modules so expensive?

The Zigbee hardware looks quite simple to produce1, why are they so expensive? For comparison I can get a 855 Mhz wireless module for 2-3€ but I can't find Zigbee modules under 15€. [1]
jwillmer
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Is Wi-Fi HaLow unsuitable for IoT applications because it operates in unlicensed frequencies?

The Wi-Fi Alliance's relatively new Wi-Fi HaLow (802.11ah) specification seems to be ideal in some characteristics for IoT devices: Wi-Fi HaLow will enable a variety of new power-efficient use cases in the Smart Home, connected car, and digital…
Aurora0001
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Securing 433 MHz wall light switch

I'm planning to use a simple light switch, that is placed on the wall. The switch gets power from the battery or piezo and sends unique sequences of data (on on- and on off-events) over 433 MHz to the receiver, that is connected to my…
Boris Brodski
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My home monitoring camera sends me thousands of e-mails every day

I've got a Linksys Wireless Internet Monitoring Camera (WVC54GCA with the recent firmware), which I've setup at home. I configured it to send me 5 second short videos to my e-mail on any physical movements during my absence. Despite my effort to…
kenorb
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Can programs loaded onto NodeMCU board be extracted?

I am using a NodeMCU board with WiFi capabilities to build a simple asset tracker. I have managed to find a few Arduino sketches that enables connectivity to Azure IoT Hub and post messages. One of the keys I need to "load" onto the board is the…
rams
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What is an “Embedded Agent” in reference to a Low Powered IoT Edge Device?

Question: What is the underlining design behind an “Embedded Agent” in relationship to low powered Internet of Things (IoT) edge devices? Some of the IoT cloud service vendors keep referring to installing an embedded agent on the sensor based edge…
Mahendra Gunawardena
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