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1500 questions
8
votes
2 answers
Does CoAP have a lower footprint than MQTT?
I recently read a Quora question about whether CoAP or MQTT is more lightweight, but the answers don't seem particularly satisfying and all contradict each other: the top answer says MQTT takes fewer resources, and another below that says CoAP is…
Aurora0001
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8
votes
2 answers
Creating indirect (managed) connection between audio source and sink in CSR bluecore VM
After looking around this site and the meta (for example, here and here), I am assuming this question is on topic here (but let me know if it's not)
I am using CSR8675 Bluetooth chip with ADK4.0.1 (Audio Development Kit; the software suit for…
user17915
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8
votes
1 answer
Best practices for secure Over The Air updates
What are the best security practices to follow when issuing an OTA update to a fleet of IoT devices? What are the significant causes for concern?
For example,
preventing an update from being intercepted
following established standards
platforms…
Noam Hacker
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8
votes
2 answers
Why arp -a does not show all devices connected to WIFI?
I am trying to see the IPs of all the devices connected to my WIFI. Everyone suggests to use the command arp -a in the terminal but when I do so I get always the same list of devices. I try to connect new ones but they do not show up. However if I…
Federico Gentile
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8
votes
2 answers
UK-compatible (240VAC) receiver/controller for ceiling fan with dimmable lights
I have a 3-speed ceiling fan with integrated dimmable lights which when installed prior to my owning the house was fitted with an infrared wireless receiver.
For a long time the remote did not work (poor quality construction) and after repairing it…
richhallstoke
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8
votes
1 answer
Can you teach Alexa a new skill by voice?
Can you enable a new skill in Amazon Echo by voice?
Ideally, I'd like to ask Alexa which skills they offer related to a specific category (like dictionary), then I'd like to enable one.
Is this possible?
kenorb
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8
votes
1 answer
Cannnot send from Arduino to Raspberry pi via LoRa
I am trying to send messages from my Arduino to my Raspberry pi. But I don't understand why the pi isn't receiving the messages.
On the Arduino side I'm using an Arduino UNO with a Dragino Lora/GPS shield, using the Radiohead library.
On the Pi…
metichi
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8
votes
1 answer
Decrypt ZigBee traffic of IKEA Tradfri
I'm currently trying to decrypt the traffic in a IKEA Tradfri Network (some bulbs, a 5-button remote, a gateway). I use a CC2531 Sniffer with ZBOSS and Wireshark to sniff the traffic. This is working perfectly fine but I am having a hard time…
ItsMarvolo
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8
votes
1 answer
What will be the result of the following connection scenario in an MQTT network?
In MQTT it is the client who initiates the connection with a CONNECT message.
The first field of the packet is the clientId:
The client identifier (short ClientId) is an identifier of each MQTT client connecting to a MQTT broker. As the word…
Bence Kaulics
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8
votes
1 answer
How does the Nest Protect autotest?
I've been reading about Nest's various devices, and one particularly useful device has come to my notice: Nest Protect. However, one thing still puzzles me. It says on their web page that:
The new Nest Protect has been redesigned from the…
anonymous2
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8
votes
1 answer
ESP32-CAM Camera init failure, SCCB write failure
I can successfully flash my ESP32-CAM to do the blink demo but when I try to run the code below I get the following error (b/t the asterisks/bar.)
It seems the "Serial Camera Control Bus" (SCCB) is not able to connect to write to the buffer in…
Jerrad
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8
votes
1 answer
How do I stop an Amazon Echo from making a sound after restarting?
When booting, the Amazon Echo plays a sound and says 'hello', which is usually not a problem, but I'm concerned that if I have a power failure in the night, the Echo might reboot and play a loud sound, waking me up.
One user seems to have…
Aurora0001
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8
votes
1 answer
Disadvantages of decentralized peer-to-peer networks in IoT
I have recently read an article about why IoT should switch from the now dominant centralized (server - client) model to a decentralized peer-to-peer solution.
Reasons against centralization:
Connection between devices will have to exclusively go…
Bence Kaulics
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8
votes
0 answers
Using Wi-Fi hardware for ZigBee
Is it possible to use Wi-Fi adapters for communicating with ZigBee devices? Wi-Fi and ZigBee both use the 2.4 GHz range, so the radio hardware should be identical, right?
Since I can not find any information on this in the web, I suppose there must…
Questioneer
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8
votes
1 answer
Sensors for a Validation Research
I've been searching for wireless sensors that could track the following metrics:
Location (GPS)
Heart Rate
Head Movement
Length of Steps
Skin Conductance
Pavement location
(relative location compared to the walking lane, needs to be more accurate…
Rotem R.
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- 1