Questions tagged [communication]
For questions relating to protocol-independent communication methods between user and machine as well as between machines within the IoT ecosystem.
88
questions
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Is there a cheap satellite modem for IoT?
I just want M2M data transmission, low rate is ok, latency is not a major problem.
I am talking anything from a few kB to a few mB of data per device, per day, and have no problem with latency of a ...
2
votes
2
answers
26
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How can you send data(via cellular) from a arduino to a server?
I'm pretty new to IoT so forgive the basic questions, but I need to send data from an Arduino that is constantly collecting sensor data to a home server.
I wanted to know where to start with this ...
- 21
0
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0
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46
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Serialization scheme to adopt for a system
I'm designing an IoT system, and seeking to adopt a serialization scheme for communications across the entities (Cloud to Device communication, Local Communication,...) taken into consideration some ...
- 41
0
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0
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7
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Verification of CMAC
How to Verify CMAC in install for install command in javacard..
I used the process given below but this method not able to verify
Key = Session Key for CMAC,
IV = CMAC which is given in external ...
0
votes
1
answer
36
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How can this PV-monitoring system communicate bidirectional
I've got a solar panel system with a Growatt inverter.
The system has a monitoring platform. To connect the inverter to the internet to let it communicate with the monitoring portal, you need a "...
- 131
1
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0
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23
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OpenMote B wireless communication
Is it possible to make two "OpenMote B" devices communicate with each other (through WiFi or on other frequencies), transmit and receive data?'
If yes, is there an example of such code to ...
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0
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0
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13
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Alexa drops lamps and switches regularly
I have used fauxmoESP, Espalexa and Tasmota for a couple of switches and lamps. What I see is that Alexa drops those units after some time. Starting discovery then again finds the units and the cycle ...
1
vote
1
answer
108
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Controlling Google Assitant compatible devices via HTTP/MQTT
I would like to control an IoT device that is compatible with Google Assistant/Alexa/Smart Life locally within my network using some open API over HTTP/MQTT. Is this even possible or is the only way ...
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1
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1
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321
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Real-time web-app for IOT devices
Goal
I'm currently building a web-application to control multiple IOT devices over the cellular network, given the nature of the devices (working off battery power and operating in network constrained ...
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2
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2
answers
576
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ESP32 UART reads garbage
Well, I have no experience with ESP32 UART, tried it and failed. In brief: I need to implement a data exchange between ESP32 and external module via UART. And at some point I need to read the data ...
- 161
1
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1
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96
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Allowed RF frequencies in UK using RFM69
I am thinking of buying an RFM69HCW FSK module from Adafruit.
However I am confused as to which module to buy, the 433 MHz or the 900MHz version. Are both allowed in the UK?
If they are then why do ...
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0
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50
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What exactly is an IoT Definition Engine?
So , i was watching an IoT primer video on YT, which i found to be helpful and moderately detailed
In the picture shown, they were showing the IoT Reference Architecture ( which i believe to be the ...
- 171
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211
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How to capture Ultrasonic Cross-Device Tracking signals?
I found out that many devices as PCs, TVs, cellphones and more can use a technology called ultrasonic cross-device tracking. This means that there are ultrahigh sound frequencies which propagate from ...
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4
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1
answer
111
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What type of server would be better for embedded TCP/IP communication?
We want to setup a server in the Azure cloud. But we have no idea what type server would be best for working with the devices which uses embedded TCP/IP protocol. Device is a 4G based OBD-II Diagnose ...
- 41
1
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1
answer
1k
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Getting IP and MAC address of LTE modem using AT commands
I have an LTE modem connected to my mcu. It's a simcom7600 modem.
I am trying to find the IP and MAC address of the modem (I need that, so that I can hook up lwip and start communicating to the ...
- 113
0
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1
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61
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What is the proper IoT architecture using Googles services?
What am I working on?
I am currently working on a project that will in the future be connected to the cloud.
I have a PLC that will be connected to the cloud. When the “process” starts, the PLC will ...
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1
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81
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Mobile device connected to custom WiFi IoT network drop connections
Intro
I have a custom hardware that create a Wifi network and allow users to connect to it (mobile devices). There is no cellular SIM card, only wifi.
Once connected, through sockets, I'm able to ...
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2
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167
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How to send data from BLE MCU to the Windows?
I have one nRF based 52840 device, which I am using to send the data by using BLE technology, my laptop has windows 10 and Bluetooth 4.0, which can detect the BLE but it cannot even connect to it.
I ...
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0
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260
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Flutter vs React Native (for building IoT Applications)
Good day Experts! I need your valuable suggestions regarding a very important decision in my development life. I need to know which framework is best suitable for IoT applications like communicating ...
0
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1
answer
87
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Connect multiple smartphones to single IoT device [closed]
I am new to IoT. I want to connect multiple smartphones (simultaneously) to single IoT device (chipset), wirelessly, but without internet.
I want to turn on/off some electric device (for example, a ...
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1
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2
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104
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Problem with UART of Fona 3G from adafruit. (aka SIM5320a)
My issue is fairly simple to describe but I have no idea what the problem could be. So I got my FONA 3G and immediately after taking it out of the box, I connected the battery and I wired up my FTDI ...
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2
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0
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27
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How to find a specific BBC debate or podcast using Alexa and TuneIn?
Kinda silly, but looking at:
This show will be available later. Please come back then.
https://tunein.com/radio/Intelligence-Squared-Debate-p510948/
Is there a podcast for the BBC debates ...
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1
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1
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57
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When stream security camera on TV using Google Home speaker, does the stream go through Google home?
How does Google home manage the connection to stream security camera video to a smart TV? Does Google home work as a proxy when the camera is streaming the video, or somehow it command (How?) TV to ...
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27
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eSIM - technology issue?
Let's consider a SmartWatch which has eSIM inside.
If the carrier is not supporting it, is there a chance that I can activate it?
Details: the SmartWatch in question is a Samsung one. My carrier is ...
- 101
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1
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872
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What are the advantages of NRF24L01 when compared to LORA module
i am designing an Iot project. In that project i want to transfer small bytes of information from one place to another place which is located more than 2kms away from previous location. therefore ...
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1
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0
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57
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Please ensure your device has a proper internet connection
I have been using the 1st. Gen Kevo for almost 3 years now and was working perfect until last week that stop working with all of our phones (1 iOS and 2 Android) I tried to reset the lock and from ...
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6
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1
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827
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PZEM-004 cheaper alternatives
I am an programmer, trying to monitor consumption remotely, I need some form of communication via cable to transmit (even if I trasmit it WIFi later), PZEM-004 for me is very expensive, and I don't ...
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3
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0
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457
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Using RPC in IoT environments
I would like to use RPC for communication between fog nodes. As the connection between the nodes is wireless (802.15.4), I don't want to use an RPC framework that uses HTTP (like gRPC).
I know that ...
- 31
1
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0
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224
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Receiving Data from MacBAT 5 in python
I need to be able to communicate with a PLUM-EVC, MacBat 5 from a remote server using Python. I have been given parameters, IP and Port which are required to get the data from EVC.
I am completely ...
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2
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0
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67
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MQTT implementation recommendation for an IoT device
I have used HTTP/s based REST API for IoT application and it works well but consumes more data bandwidth and power. Also, the server resources consumed are too high for the long polling-based method.
...
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2
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0
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97
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Looking for MQTT broker and client recommendations
Working to make a network of remote sensors using MQTT I'm looking for an implementation of a broker an a matching client.
Requirements
broker to be deployed in a cloud server like EC-2 and client ...
3
votes
1
answer
59
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Wireless IoT Devices at mm-wave frequencies
The upcoming 5G can be beneficial for IoT in various aspects:
higher data-rates
low latency
better utilization of bandwidth
potential wireless power transfer/harvest
Introduction of mm-waves (28 GHz ...
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3
votes
2
answers
2k
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Can somebody explain why some pins on Olimex ESP32-EVB cannot be used?
I am in need to configure two UART connections from Olimex ESP32-EVB to a scanner and to a card reader.
I was exploring the GPIO pins that could have helped to establish those connections, but ...
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1
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0
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187
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Is it possible to send data to AMQP server using AT-Command on ESP8266 Wi-Fi module?
I'm currently working on an IoT project which I have an STM32F0 connected to the ESP8266 Wi-Fi module. My goal is to publish data to an AMQP server.
Currently, I'm trying to connect to an AMQP server(...
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1
vote
1
answer
70
views
Remote sensor cloud connection
i'm just starting out in Arduino, IoT etc; I was given the Elgoo Uno R3 Arduino starter kit at the weekend and i've been trying to soak it up.
I would like to make a number of sensors for my van, ...
- 111
0
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1
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480
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Difference between Network, Communication, and Messaging protocol
My understanding is network protocols are BLE, Wifi, ZIgbee, etc. and messaging protocols are http, mqtt, etc. So my questions are:
Is my understanding so far correct?
Are network and communication ...
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1
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3
answers
2k
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Send sensor data over internet to a server [closed]
I had a project planned on monitoring sensors. I wanted to read sensor data
over the internet. How should I proceed with the setup?
Any help is appreciated.
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1
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0
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252
views
How subcarrier affects MCS in NBIoT Uplink communication?
I cannot find it in the newer 3GPP docs. So...
To calculate Transport Block Size we this use:
Note: I TBS = MCS
But I found that if we use only one sub-carrier (single-tone) in NB1 we cannot use ...
- 111
5
votes
1
answer
182
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Medical data IoT communication protocol?
We are considering connecting a medical device into a hospital patient system we are developing. We are based in the EU and must adhere to the
EU Regulation on the protection of personal data
...
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6
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1
answer
986
views
How does APN affect cellular connectivity?
We had recently deployed a few Cellular IoT devices on the field, using SIMs from a certain provider (Airtel India). They had provided us with an APN, but we chose not to program our device with the ...
- 143
2
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1
answer
602
views
How Smart Home devices communication works
I have a big doubt that I'm not able to solve.
Basically, I want to understand how the smart device that I have in my home communicate with their servers, or better, how their servers can call its ...
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3
votes
1
answer
428
views
Why there is no LPWAN technology in HF or VHF band?
This is a question which I have been wondering ever since I started exploring LPWAN technologies.
All the LPWAN technologies I have found (like SigFox, LoRa, Ingenu etc.) work in UHF band (300 - 3,...
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6
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1
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174
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Send wirelessly very small amount of data
I need to transfer wirelessly a message of maximum 5 bytes of data (including everything such as start bits, stop bits etc etc).
What I tried:
Empty Ethernet package is at least 56 bytes according to ...
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2
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0
answers
96
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Sigfox Callback CustomValue's issue Sending NULL instead of wanted values
I'm working on a project, and I want to use a Sigfox callback to send some data.
But when I want separate my payload as I coded it, all my values on Callback are NULL.
This is my Callback, and this ...
1
vote
1
answer
282
views
Reverse rpc/device control
Is there a common standard/practice for having an IOT device establish a connection to a command and control server, and then act in a server role (i.e. the C&C sends requests to the device and ...
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4
votes
1
answer
142
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Standard message structure for communication in HTTP
My question might be a little strange but I can't find any answer to it.
I'm designing a simple IoT system that has some devices as a client and a server that controls these clients like reading ...
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4
votes
2
answers
3k
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Can I use MatLab code in esp32?
We've some method to run the MatLab code in esp8266 microcontroller. We can manipulate Arduino pins using Simulink in MatLab.
Can we do the same with an esp32 microcontroller as their code can be ...
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0
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707
views
GPS/GSM Tracker not sending location [closed]
I bought GPS/GSM Tracker from eBay but it doesn't work and i can't get Location
Steps I followed:
I bought a new sim card with calls and data (checked that it working)
I installed an app on my ...
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3
votes
1
answer
2k
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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 ...
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4
votes
1
answer
363
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Remote com (serial) connection through cellular IoT
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 ...
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