How start a project SMS to send message to local mobile phones using SignalR technology. Any help in this regards will be appreciated.
SignalR is used to send data via WebSockets. What you want to achieve is completely different.
You could use SignalR to for example, send notifications to your phone to an app but SMS is not a responsibility of SignalR.
You can read more about SignalR here.
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I am trying to make connection between smart watch to machine
Is there any good library to send and receive message for an Android and to make things easier? Phone must work as a client which can send and receive data from server.
so im doing a side project, and i want to use Angular with asp.net REST api connecting to a mssql server.
the project is basically a site that could be placed in a company/school canteen, with a touch screen, and an rfid scanner for employee cards.
i've got no issues with the angular / api part. but how would i go about reading events from a rfid scanner from angular? is this even possible?
the usecase is that i want to scan the employee card, then in the angular client app, prompt if the user is correct "Welcome, are you "firstname" "Lastname"? (confirmbutton)"
then use the gathered employee informations later in this process when the employee checksout from the canteen.
Scenario 1: Server and RFID reader are on the same device
Example:
You have a Raspberry Pi 4 with Raspberry Pi OS and .NET 5 on it. You buy a RFID reader like this one, and you either find a library for it (like this one) or you start reading the datasheet and write your own library with .NET I2C or SPI APIs. Then your ASP.NET Core website on the Pi will listen for RFID events (maybe with a background worker or maybe another .NET app will notify it with gRPC or API) and notifies the client (Angular in you case) with WebSocket or polling or some other method.
Scenario 2: One server with many web clients on other locations
Example:
You have an ASP.NET Core API that doesn't know anything about RFID and just works with normal data like any Web API. You then tell your clients to buy a USB RFID (like this one) and you use Web USB API inside your Angular app to communicate with the RFID device (I don't know how) and then call necessary APIs on the ASP.NET server. (BBC micro:bit uses this method, they connect to their devices via Web USB)
Example 2 (this is probably the easiest way):
Write an Android app with Ionic that uses the NFC plugin to communicate with NFC tags and call any API you want. You can then run it under kiosk mode. All your clients need then is a cheap android device.
Note: You can combine these scenarios, for example in scenario 1 you can still call a centralized API.
We seek your help in implementing bluetooth on our smart home controller. Our current scenarios is described below:
We want secure communication between our embedded linux controller(our smart home hub) and user's mobile phones running android/iOS.Our system is in home automation.
The hub in turn communicates with home devices that support a different protocol - we need to make communication between hub and mobile devices using bluetooth.
Currently there is not direct communication between our hub and mobile phone except through the internet.
We will use Bluetooth 4.x, not 5 for hardware support on the controller.
We are using nodejs on our controller and standard bluethooth OS libraries on android/iOS. We are open to suggestions.
Our main concern is to establish secure communication between phone and the hub. With this regard we are looking for implementation guidance on pairing and communicating securely. We have been able to establish unsecure communication - exposing characteristics and services on the hub. Our understanding of the bluetooth protocol is limited and we have only used libraries available for users.
Please provide specific pointers as to what we should do and what is possible.
Is it possible to send data from ESP8266 Nodemcu to Microsoft Azure using 'Event Hub'. while searching on the internet i am getting results were they are using Azure Iot Hub. Since my application does not require bi directional communication and also azure iot hub service is very expensive than azure event hub service i would prefer if it is possible to use Azure event hub with esp8266 Nodemcu .
can anybody direct me in the right direction.
You will want to use the Event Hubs REST API for that.
API documentation: https://msdn.microsoft.com/en-US/library/azure/mt652149.aspx
A proof of concept implementation with Arduino: https://www.hackster.io/stepanb/proof-of-concept-nodemcu-arduino-and-azure-event-hub-a33043
Full-blown client implementation for Arduino: https://github.com/gloveboxes/Arduino-ESP8266-Secure-Azure-IoT-Hub-Client
There is a GPS device which can send data to IP:Port. I have a website hosted on IP 1.2.3.4
Can I send GPS data from the device to that website? 1.2.3.4:8080? How I will retrieve the data?
This is the device
http://cgi.ebay.com/GSM-GPRS-GPS-Vehicle-Car-Tracking-System-Tracker-Device-/270683202099?pt=AU_Car_Parts_Accessories&hash=item3f05f9e233
Maybe this should be a comment...
To be honest we can't answer that question the device will most likely use its own data format(s) so the service that receives from it will have to implement those. Additionally the device might not support web protocols, it could use raw TCP sockets for example, so you may have to implement a listener service that adheres to those protocols. In fact it looks like the device uses GSM (a mobile telephony standard), so using a web site to receive the data is definately off the cards unless you have a GSM proxy service sitting between the device and the web server.
Assuming that you are allowed to implement your own service it follows that the documentation will include the necessary details and if you are lucky a full SDK that you can use.