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Questions tagged [iot]

QUESTIONS MUST BE PROGRAMMING RELATED.. Use a more specific tag for your question instead, e.g. [wifi], [bluetooth], [c], [arduino]

The Internet of Things (IoT) is a novel paradigm where many of the objects that surround us will be connected to the Internet, these objects can be Radio-Frequency IDentification (RFID) tags, sensors, actuators, mobile phones, etc. and through unique addressing scheme, are able to interact with each other and cooperate with their neighbors to reach common goals.

While programming questions about Internet of Things are on-topic here, other questions should be asked on the new Internet of Things Stack Exchange site.

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If the question is not programming related then it may be on-topic at Raspberry Pi Stack Exchange, Internet of Things Stack Exchange or Unix & Linux Stack Exchange.

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What is the difference between MQTT broker and Apache Kafka

I am developing a mobile messaging app. I was going through technology needed and found two MQTT & Apache Kafta. To me both seems doing the same thing in the same way (in terms of subscribing & publishing to a topic). I heard that MQTT is fit for…
Manish Kumar
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Force Android to Use Wifi network with no internet

I am building an android app that needs to communicate over a WiFi network that will not have any internet access. The problem is that even when the WiFi is connected android chooses to use cellular/mobile data when no connection internet is present…
Lonergan6275
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What is the maximum message length for a MQTT broker?

I am using the node.js mosca MQTT broker for some internet of things (iot) application. https://github.com/mcollina/mosca What is the maximum message length that a topic can receive for the mosca broker? What are the factors that constrain the…
guagay_wk
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How to get Unicast, Dns and Gateway Address in UWP?

I'm trying to find Unicast, Dns and Gateway Address in windows IOT. Normally I can access these values with NetworkInterface.GetAllNetworkInterfaces() method. But in UWP, that method is missing. Is there any alternative for getting these values?
kaya
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Ensure that target device has developer mode enabled. Could not obtain a developer license due to error

I am following this tutorial and get the following error: Severity Code Description Project File Line Suppression State Error DEP0100 : Please ensure that target device has developer mode enabled. Could not obtain a developer license due to error…
Mona Jalal
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Android dealing with IoT devices with NO Internet connection

I'm trying to build a project where I must pilot an IoT device from smartphone via Wifi. This device has the SPWF01 Wifi Module integrated, and is configured as an access point (that has no Internet access) with security type WEP. On this access…
Starivore
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Send request over WiFi (without connection) even if Mobile data is ON (with connection) on Android M

I have to send UDP packets to a WiFi module (provided with own AP) with no internet connection but when I connect the mobile with the AP, Android redirects my packets on the mobile data interface because it has got internet connection. I've used the…
Alessandro Muzzi
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AWS IOT - Credential should be scoped to correct service

I am trying to access a simple AWS IOT REST service but I have not been able to do so successfully yet. Here is what I did. I created an iam user in my aws and downloaded the access key and secret key Logged into AWS IOT with that user and created…
Robby
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IoTivity vs AllJoyn - what is the difference?

Open Interconnect Consortium has just released IoTivity, an open source framework for IoT, similar to AllSeen Alliance's AllJoyn framework. What are the differences between them, apart from IoTivity being based on CoAP and AllJoyn based on D-Bus?…
niutech
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Compare Intel Galileo and Intel Edison

I am quite new to the Internet of Things. I checked the Intel website and went through a few other links too. But I cannot clearly understand what is the difference between Intel Galileo and Intel Edison? And which one should be used when? Does…
TorukMakto
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Mosquitto: Starting in local only mode

I have a virtual machine that is supposed to be the host, which can receive and send data. The first picture is the error that I'm getting on my main machine (from which I'm trying to send data from). The second picture is the mosquitto log on my…
FlasH
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Connecting an Android app to a wifi without internet access

I have an expo app that works as a companion app to an IoT device. To connect the device to the wifi, the app has to connect to the device's wifi and send it a network call containing the wifi info. Up until Android 9, this worked fine. But as I…
Matija Martic
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Why Primary key and Secondary key in Azure IoT hub?

When creating a shared access policy or registering a device in Azure IoT hub, there will be a Primary key and Secondary key pair generated. And I noticed I can connect a device to IoT hub using either Primary key or Secondary key. So, what's the…
Shuping
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Is video streaming over IoT protocols feasible?

Can Video streaming (low bitrates like 50 Kbps ) could be done over IoT protocols like CoAP/MQTT with much better performances compared to HTTP/RTP or TCP/UDP streaming? Or underlying video streaming architecture does not help the use case using…
Main
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Horizontally scaling mosquitto broker

I am considering mosquitto for a MQTT broker. From what I've read, I realized that Mosquitto doesn't support Horizontal Scaling. So far all other criteria of my requirements can be met with Mosquitto. I'm not sure if the question is too generic or…
Dhanushka Dolapihilla
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