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1500 questions
3
votes
0 answers
Connect IoT devices to AWS
I have a Moxa I/O Remote connected to a Raspberry Pi running some scripts through pymodbus. I am using MQTT to publish & receive changes/requests in the I/O remote to a web service.
The idea is to have the web service & I/O remote running in one…
user2868900
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3
votes
1 answer
Where do SonOff schedules reside?
Using the stock firmware, I've set up a schedule for my one SonOff RF using the app on my phone. Observation suggests that this schedule is not running, and I wonder if this is because my phone is aggressive about killing background processes when…
Sean Houlihane
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3
votes
0 answers
How to optimise WiFi and ZigBee Coexistence
Assuming I'm not ready to give up 2.4 GHz wifi just yet, and I'm mostly immune to interference from nearby installations (i.e. I have control of any relevant configurations), what should I be doing to minimise disruptive interference between the…
Sean Houlihane
- 10,504
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- 61
3
votes
0 answers
Proper way to add an Echo Dot 2 to my existing system
I have an Echo 2 paired with an Amazon Bluetooth receiver which in turn feeds an 70v Amp that plays throughout the home. This works. However, my wife has to constantly go from the Kitchen to the Great Room to speak to "Alexa."
My solution was to…
DJGray
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3
votes
2 answers
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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3
votes
0 answers
Most scalable LWM2M server implementation
What is the most scalable (considering the number of IoT devices managed) server side implementation of the OMA LWM2M protocol? Which language is it using?
We can use Eclipse Leshan as a benchmark, which is written in Java.
To be more concrete,…
Rexcirus
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3
votes
0 answers
Can't Exclude or Reconnect Switch
I have a Smartthings V2 hub that supports my Z-Wave mesh. I have GE Dimmer Paddle Switch that stopped responding to my hub. I tried to exclude it (both just the item in question and then a general exclusion). The exclusion process hung up and it…
salisboss
- 181
- 1
3
votes
1 answer
Possibility of integrating secure elements with sensor networks?
Assume we need to do a type of digital signature such as ECDSA with sensors used in sensor networks. So, is there a secure and possible approach to store the keys in these sensors?
For example, is it possible to integrate a secure element with…
Questioner
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3
votes
2 answers
What happens internally when ESP8266 goes into deepsleep mode?
What happens internally when ESP8266 goes to deep sleep mode. Is there any official documentation explaining that?
a-c-sreedhar-reddy
- 477
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3
votes
2 answers
Choosing a microcontroller for IoT project
I'm currently working on an IoT project. The principle is to have a box that could connect to a phone over Bluetooth on some NFC contact. After the phone and the box will communicate messages over Bluetooth to the phone.
The box must be able to pair…
Sebz
- 31
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3
votes
1 answer
Distance calculation based on RSSI value
I want to calculate the RSSI value of a Bluetooth module (HC05) and from the derived RSSI value I want to calculate the distance of the surrounding devices. I'm using an Arduino Uno r3 as a controller and the Arduino IDE as a programmer.
Actually I…
Arockia Jegan
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- 4
3
votes
1 answer
Can't connect to Onion Omega 2
I have an Onion Omega 2 which I haven't used for a year or more and would like to use for an IoT project.
I have attached it to the Expansion Dock, and connected it to my laptop with a USB cable.
Four white LEDs flicker constantly, but I don't see…
Mawg says reinstate Monica
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3
votes
1 answer
MQTT Library for Arduino using GSM
I am developing a vehicle tracking device.I want to send data to server through MQTT from my sim808 GSM module.But I couldn't find any good library of MQTT for Arduino. There are so much resources for Wi-Fi module but I'm using a GSM module.
Iqbal Hossain
- 79
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3
votes
2 answers
NodeMCU connected with batteries stopped working after 2 hours
I connected nodemcu with batteries and uploaded a code which sends http post request every 10 min and goes to deep sleep. But after 2 hours node mcu stops sending the data.
Voltage regulator used is LD33V
Used AA batteries.
Battery level when…
a-c-sreedhar-reddy
- 477
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- 16
3
votes
5 answers
Can I use IRC protocol to talk to devices instead of HTTP? What are the pros and cons of it?
If I want to automate everyday tasks in a house, where it best to use IRC instead of just web services? I searched in Google and didn't find any term of comparisons.
Claudio Gonçalves
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