I'm learning GSM Architecture and it is important to know about interfaces, there are several types. I know about one that is Um the Um interface is the medium by which mobile is connected to tower for communication. it is air interface so I just want to know more about them thank you .
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I'm developing a Web application with HMI capabilities that needs to interface with multiple Modbus RTU and Modbus TCP PLCs:
frequently update the web UI based on the state of the Modbus devices
send commands to Modbus devices based on the user's input
What is the best way to integrate a Web application and a bunch of Modbus devices, given the requirements?
have you looked at modbus bridges (or Modbus-RTU to Modbus-TCP converters)? and the 'middle-man' software we use at our place is Kepware which then talks to our SCADA package (Cimplicity for us). Not sure if you're still in need of any more info on this, just shout back and i'll fill you in a lot more :)
Also, does this need to be a low cost solution (you could pretty much do this with off the shelf hobby hardware) or a full-blown industrial solution? Doing a dead simple SCADA bit and then talking to the plc's shouldn't pose too much of a headache if you have the time for it.
I want to access car data from an OBD2 device so I can access car speed, RPM speed, fuel consumption, live data, error codes, etc. How can I connect and read from an OBD2 device in iOS?
It depends on OBD device you are going to use.
There are devices on WiFi, accesible by IP-address (using TCP or UDP protocol), by bluetooth, works like RS-232 port, and some other devices, which can directly be connected by cable.
I have recently open sourced my OBD2 library for iOS & macOS that abstracts the transport protocol (WiFi, BTLE, CaptureFile), vehicle protocol (CAN, KWP, PWM, ...) and more into a set of reusable classes. Check out https://github.com/mickeyl/LTSupportAutomotive which might help you creating an own OBD2 application.
I would highly recommend going through the stream programming guide on the iOS developer library as this has code that does exactly what needs to be done for talking to a ELM wifi device.
It's really not much more than that, be sure you have the right IP and Port when connecting.
I'm tinkering with an iPhone-controlled RC car chassis that is the base of my robotics project. The chassis is controlled with a WiRC Wi-Fi module. It has eight outputs to control electronic speed controllers and servos.
I'd like to improve my robot's ability to avoid obstacles using sensors. For this purpose, I have an Arduino board which I can interface with various inexpensive rangefinders and proximity sensors. I'm looking for examples or demo projects that would connect an iPhone to an Arduino board using Bluetooth to send commands to the board and receive data from the board. Is what I'm thinking of possible?
Thank you for any links to projects or hardware boards that may interact with an iPhone using Bluetooth. It's great if some of these boards have an SDK to simplify development.
Unfortunately, standard Bluetooth communications with devices on iOS is restricted to devices within the MFi program, so you're not going to be able to use that with your Arduino board. However, the new Bluetooth 4.0 LE protocol that is supported in newer iOS devices (iPhone 4S, Retina iPad) is open and can be used to connect any LE device.
iOS 5.0 introduced a new framework for this in Core Bluetooth, and I highly recommend watching the two sessions from WWDC 2012 about this. They also have some sample code on the topic. I've been using this myself to connect to some sensors, and it works well for a low-bandwidth application like temperature, proximity, or heart rate sensing.
There are several BT LE modules out there, and it looks like Dr. Michael Kroll is about to start producing an Arduino shield for LE communication, which would make it trivial to add this kind of capability onto an Arduino board.
It's probably a bit late for your project, but the RedBear BLE Shield coupled with an Arduino works great. There is even a robotic truck project built around this combination in Building iPhone and iPad Electronics Projects.
You can access the BLE shield using Objective C, but it's also possible to avoid a Mac entirely and use techBASIC, which lets you program right from the iPhone or iPad.
What is the best way to realize wireless communication between an embedded system (based on an AVR controller) and the iPhone? I think there are only two options: either WiFi or BlueTooth. The range is not really a problem, since both devices should stay in the same room.
I have no idea, if there are any useful WiFi boards that can be connected to an AVR based microcontroller system (or any small microcontroller), any hints would be highly welcome.
I guess the better solution would be BlueTooth, but there is also the problem: which BlueTooth board is best suited for attachment to an AVR system, and is it possible to use the iPhone BlueTooth stack for (serial) communication over BlueTooth with the AVR device.
I hope that somebody already realized such a system and can give some helpful tips...
You can get modules for both WiFi and Bluetooth that will connect to an embedded system through a UART interface, however a WiFi module will have far more processing power than your AVR microcontroller, often with spare capacity and I/O to execute additional user code, so connecting one to an AVR maybe somewhat redundant in many cases.
Bluetooth modules are simpler, less expensive, and the data-rate is better matched to the AVR's capabilities. For example these Parani modules. I have used them between an embedded system and a Laptop PC's Bluetooth, so given appropriate communications software, there is no technical reason why it could not be used with an iPhone I think. However this may be the flaw, on the PC the device was recognised as a virtual serial port, I don't know whether iPhone supports 'legacy' communications in quite the same way.
For comparison, a WiFi solution
From what I know, BlueTooth is very limited on the iPhone: There is only very few BlueTooth-Profiles implemented, and - even if they can be extended with a jailbroken iPhone - I doubt this is easy to use from the application layer.
On the other side, transferring via WiFi requires a lot of processing power and memory since much more things have to be implemented before you can even start transferring data: 802.11, cdma/ca, arp, tcp. That's a big task.
Is it an option to build a hardware extension to the iPhone ? You might be able to get the serial connection and power out of the dock connector. Then even ZigBee could be very helpful.
Here's an article you might find helpful. I would lean toward a WiFi solution just because of the added flexibility available.
http://www.embedded.com/design/networking/215801088
-t
Some of the other people at the office have done AVR <- Bluetooth -> Symbian and AVR <- Bluetooth -> PC solutions without trouble. There is lots of info, reference designs and source available. I have no idea of how hard it would be to use Bluetooth on Iphone.
The exact module is probability also not important as long as it got some type of serial interface (I2C,SPI) to interface to the AVR and some source code show how to use the module.
Is it an 8-bit or 32-bit AVR? For the AVR32 processors there's support
for WiFi in the Atmel 1.5.0 Software Framework using SD-card-mounted
WiFi modules from HD Wireless (http://www.hd-wireless.se), including
an IP stack (lwIP). Be aware that you need Ad-Hoc (IBSS) support to
connect directly to the iPhone.
There is WiSnap kit. It can connect directly to a standard RS232 interface or through the TTL UART interface to embedded processors. We are planning to use it in our project. It also has Ad-Hoc support.
There are some usage examples and an iPhone application for connection setup.
http://serialio.com/products/mobile/wifi/WiSnapKit1.php
What are you trying to communicate between your AVR and the Iphone? The Iphone is made for the web along with everything apple (which AVR's are decidedly not). So what works well is an embedded device that exposes a web-interface. Like the Transmission bittorrent client on Linux. Also nowadays many low-power small form-factor linux platforms exist that will allow you to do this.
For instance Gumstix has an ARM based platform that runs linux and includes WiFi (Overo Fire).
I am looking for a way to establish a wireless connection between an iPhone and a desktop client. Gamekit looks promising but all the examples / documentation only explain iPhone to iPhone.
Are there examples / documentation for an Gamekit peer on the desktop (cocoa or java)?
What are the alternatives without doing to much low level socket programming?
The iPhone emulator does not run these bluetooth p2p connections. Hence, it can only be tested with real hardware.
It is a little confusing because the GKSession reference talks only about being a way to connect peers over bluetooth, while the GKPeerPickerController states "can be configured to select between Bluetooth and Internet connections." However there's a clear note there that they're not really going to help you with internet based connections.
This is unfortunately a non-answer, but...
GameKit is an abstraction of the bluetooth and wifi networking layers, allowing a specific set of protocols for communication between two devices -- to communicate with a desktop client, you would need to replicate all of the GameKit functionality on the desktop, since there is no comparable API on the desktop. This would not be a simple undertaking.
I would highly suggest developing something over bonjour, as #Jordan suggested. Bill Dudney's project (blog article). It's a great place to start.
Citing Game Kit Framework Reference's Features paragraph:
Peer-to-peer connectivity allows your game to create an ad hoc Bluetooth or wireless network between multiple iPhones in the same local area. Although designed with games in mind, this network is useful for any type of data exchange among users of your app. For example, an app could use peer-to-peer connectivity to share electronic business cards or other data. This functionality is only available on iOS. You can also get the same functionality using Game Center.