All Questions

I would like to send values from the HomeAssistant to an ESP8266 via MQTT. I have already successfully done it the other way around (sending temperature values from the ESP to HomeAssistant via MQTT) ...

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?

I am looking for any information about the house home phone. Protocol, any board I can use to make a phone call. I want to make a very simple device which can make phone calls and leave a message, and ...

I am very new to IoT, and I want to make a first project of outdoor auto watering plants (one sensor for each plant). So, I bought a Raspberry Pi, several cheap moisture sensors, but I don't know how ...

I have a Ring Video Doorbell 2 and an Amazon Echo Dot. I cannot hear the chime of the doorbell throughout my home. There is an Alexa Ring Skill that seems to focus on the video. It technically does ...

I am wondering about best practices of topic naming and payload design of mqtt messages. Is it better to have multiple and long topic names instead and a bigger payload or short topic name with ...

I want to use atmega128. I have added atmega128 with the help of Megacore . But bootloader.hex file is not generating when I compile the file. Now, what can I do to solve the problem.

I want to build a web application using aws Iot. I build SCADA systems for different companies. I have a modbus rtu master(raspi) connected to many slaves on a factory floor. Modbus master is ...

I have multiple Alexa Dots on my account and when using the app on my Android phone I do not get the option to choose which device to drop in on. It constantly defaults to one device. When I try a ...

I am new to Lora technology. I am using a sx1272 Lora Module and I am trying to send and receive data to a Dragino Gateway. The problem is the sx1272 and Dragino use two different libraries and hence ...

I am an experienced developper, and I want to learn IoT beginning with a small project. Automatic Watering the plants of my house. Here are the requirements: The project is for learning purpose It ...

I hear news stories that millions of thermostats and fridges have not been properly secured by their manufacturers. I could understand how something running linux with sshd running (as it might well ...

Smart speakers like Amazon Echo or Google Home are starting to become common. Is there a community effort to create an open source Linux firmware that can be run on them? I am thinking to something ...

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 ...

I’ve been looking for a temperature sensor for my PI3 home thermostat. I’m to the point where my app is stable and running for over 20 days with the only issues relating to the temperature sensors. I ...

Anyone knows if there's WiFi hotspot on the Chevy Cruze 2013? When I tried creating an account for OnStar it says I need to go to my dealership to upgrade my OnStar hardware...has anyone upgraded?

I am making a GSM Tracker with SIM800C module. After deploying it into vehicles, it works fine... But after some days, it starts responding as CME ERROR: 15 SIM wrong for command AT+CPIN? & CME ...

I want to set up a virtual lab where students should be able to login and get access to an instance to the development platform to write code for web development(For example in HTML, Express JS etc), ...

It is said that there is no standard for IoT Protocol Communication. What does it mean to say that?

I'm realy a newbie in cryptography, I want to do MQTT payload encryption with AES, i've done it with PyCrypto library, but i'm still wondering how I can encrypt AES key before sending it to the ...

Are 4G industrial routers compatible with 3G and 2G network?

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 ...

I want to simulate the collision avoidance between different objects that use (IoT based) centralized, decentralized, or distributed wireless sensor network. What are free software available to ...

I am trying to implement a control software (client) that communicates with a number of distributed devices (servers) over Modbus. I have been reading device documents to find out where the data I ...

After a year of testing, my IoT project come to an end. It operates mainly on RPI0 using Python code, and ESP32 using MicroPython code, all connected using MQTT protocol running on RPI3. Now i;m ...

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 ...

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 ...

I'm designing on an IoT device that connects to a web server and publishes/subscribes to the MQTT service. Users download an iOS app to setup/register/use their device. Question: What's the ...

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 ...

If wifi that my Nest camera is connected to goes down, can it reconnect to an alternative wifi? In other words if the "thieves" cut the broadband cable, but I still have a 4G router as a backup, would ...

I have an apartment with no light switch or ceiling light for the living room. I have a lamp that's plugged into the wall. Because it's an apartment, I can't just install a physical light switch. All ...

Has anyone reprogrammed a commercially available smart plug, such as the Etekcity Voltson? Are there plugs available with open source Wi-Fi chips in them that perform better than an ESP8266? I’m ...

I am trying to send the sensor data (HC-SR04 ultrasonic sensor) from loRa client to LoRa server, but it seems that the loRa has occupied all of the digital pins and does not continue the loop and it ...

Are there any limitations ( mainly amount of messages) when using free MQTT server ( such as iot.eclipse.org ), that causes from time to time not to publish messages? I have 2-3 device connected at ...

I want to power my nodemcu module with 3.3 V. Does powering it with 3.3 V also power USB-UART module? If so I do not want this as it eats the battery.

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 ...

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 Node-RED documentation is clear - set metrics to true to track flow execution and memory usage information. So, I stopped Node-RED with pm2, edited the settings.js file and started Node-RED. But, ...

I have historical data stored in an SQL database as date in the format (2017.10.27 12:00:25) and the corresponding temperature in the format (26.55). I am using the node iot_datasourse to show the ...

I'm playing around with a new ESP32 flashed with Micropython from eBay in order to replace a Rpi Zero W. Am I missing the 5v output? I need it to operate a Relay. Can a 5vDC Relay be operated as ...

An ESP32 was flashed with micropython, using esptool on Linux system ( Ubuntu 18.04 ). When I tried to runrshell after installing it, it seemed as it start executing, but did'nt reach to login part - ...

I am using Arduino IDE to program my ESP8266. I would like to send data from one ESP8266 module to other. So I would like to use CoAP for this communication. Is there any standard or good library to ...

I've bought a smart bracelet (ID115 by LETSCOM) for its silent alarms as advertised: Wake you up peacefully with a silent alarm. Alarm Alert: Set silent alarms on the tracker to wake you up ...

I have a requirement to design a proprietary monitoring system. (There's some intellectual property involved so I'll describe the system with a slightly altered purpose.) Imagine a large factory ...

From mosquitto.conf, the following options (among many others) exist for bridging. connection name This variable marks the start of a new bridge connection. It is also used to give the bridge a ...

I want to measure the power consumption of ESP8266-01. For that I connected my multi-meter in series with ESP8266 to measure the current but then ESP8266 does not power up and multi-meter gives zero.

I am using Arduino ATmega2560. I have defined Serial as CONSOLE. When I am using CONSOLE it shows me error. #include "Arduino.h" #define CONSOLE Serial; void setup() { CONSOLE.begin(...

From what I have read and understood from their documentation is that only single layer IoT hierarchies can be maintained with either of their gateways. That is a field gateway(sort of like a smart ...

I have an old iphone 4 that I want to use via wifi in my car to use alexa to play spotify. I installed the alexa app from the app store. Because the last version of IOS for the iphone 4 is version 7....

I am a master student and my topic is about making protocol conversion among IoT communication protocols for example between CoAP and MQTT in order to make the devices that use MQTT protocol to ...