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1500 questions
7
votes
4 answers
Which IoT platform to visualize real-time and historical sensor data?
In order to prepare some tutorials for my students, I am working on a few DIY electronics projects in the field of IoT. I want to use ESP32, ESP8266, Arduino Uno, and Raspberry Pi. I am more deep on firmware/hardware part and I have no experience on…
Mohammad Taherian
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7
votes
5 answers
Which free dashboards are also MQTT brokers?
I'm trying to find a dashboard which:
Has pretty widgets for data display
Can subscribe to, and display MQTT data that I publish
Can publish commands to subscribers (eg: "Driveway light switch: turn on")
Is free for home / hobby…
Tom Hale
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7
votes
4 answers
What network technology can host 1000s of local IoT devices?
I'm analysing the technologies for an IoT device that would need to be installed in a commercial environment. The requirement is to install thousands (or maybe even tens of thousands) of small sensors/devices in a commercial setting, like a hotel,…
Alex
- 171
- 1
7
votes
1 answer
Thingspeak: message limit, update limit and bulk updates
I am looking at ThingSpeak for logging sensor data.
I would like to log three different variables at a frequency up one datapoint per second. This would be 86400 samples per day or 259200 values per day.
The thingspeak "pricing" page says that on…
Mathias Schultz
- 71
- 2
7
votes
2 answers
How does an ESP8266 "advertise" it can handle Alexa "relative volume" commands
As I understand more I WILL edit this question. For now, I am guessing at what I need. To make it easier for people to help, I'll tell you the over all purpose:
I have programmed an ESP8266 to advertise it is the TV and that it can turn the TV on /…
st2000
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7
votes
0 answers
Make ADT Door Sensors work with Ring security system?
Is there a way to modify ADT's Window and/or thin Door sensors in some way to work as door sensors for Ring's Home Security System?
I am transitioning from an ADT security system to Ring's, but am not keen on buying Ring's door sensors for $20 each…
Graeme Rock
- 171
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- 3
7
votes
2 answers
How can I use End-to-end encryption in sensors network?
I have been reading about XMPP and its extensions. One of them called (XEP-xxxx: Sensor-Over-XMPP) which is really interesting.
I have read also about another XMPP extension which is OMEMO protocol for End-to-end encryption.
Is it possible to…
Nano
- 71
- 2
7
votes
3 answers
Sonoff Dual - Where to find GPIOs
I'm looking for the GPIO's I can use in SonOff Dual ( after flashing my own software ).
In SonOff Basic - there are GPIOs to acess LED, Relay, and what is most needed for me - GPIO14 for external input as shown here
Since I need 2 Relays solution, I…
guyd
- 851
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7
votes
1 answer
Philips Hue Out of home control won't log in
I have some Philips Hue bulbs and a Bridge set up in my house.
When I am at home the Philips Hue App can connect to and control everything.
However, when I am away from home (or simulate such by turning off WiFi on my phone) the App is unable to…
Shevek
- 279
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7
votes
2 answers
Upload measurements with unix script ( RESTful API?)
A thermostat device returns JSON like data from the command line:
curl -s http://192.168.X.Y/tstat/humidity
{"humidity":51.00}
It would be interesting to setup a UNIX cron job to periodically script the upload of the data to a host so that it can…
gatorback
- 381
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- 5
7
votes
1 answer
How could I create an LPG indicator?
The LPG gas is commonly used for cooking, and it is a very common practice to cut off the gas supply by closing the valve.
Suppose I am away from my home and I forgot to check whether my LPG supply is cut-off. Is it possible to make a device that…
Chinmaya B
- 181
- 8
7
votes
1 answer
KeyError while connectiong to a MQTT broker
This is my code and on the bottom is the error I keep getting.
import configparser
from time import localtime, strftime
import json
import paho.mqtt.client as mqtt
config = configparser.ConfigParser()
config.read('/home/pi/bin/py.conf') #…
pivk95
- 115
- 5
7
votes
5 answers
Is it possible to control a home appliance remotely as well as using the switch to which it is connected?
Suppose I want to control my room lights over WiFi using mobile phone. But I also want to control them by using the switches in my room to which they are connected. Is it possible to implement them both? I watched and read a couple of tutorials on…
Sanat Deshpande
- 123
- 5
7
votes
1 answer
mosquitto - persistence configuration options
I want to understand the persistence related options in Mosquitto as described here.
To begin with, do these options apply only in case of QoS > 0 and/or retained messages?
persistence
If true, connection, subscription and message data will be…
cogitoergosum
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7
votes
2 answers
Solution for IoT web UI
I try to describe my issue with an example.
Just imagine, that I manufacture some device and every device has its own ID and optionally some password. Alice as customer bought my device and established it. And Alice wants to control this device and…
Uraty
- 171
- 1