I'm working with an android 4.0.3 tablet. I need it to communicate with a custom made board via USB serial at 9600 baud rate. The custom board's usb port allows serial connection. I was wondering of someone can point me in the direction on how i can get my application on my tablet to send and receive some information between the two. All the help is appreciated.
Dogz1
You should use USB Host API for doing this. The API documentation explain how to use the USB Host API, step by step in the official documentation page here : http://developer.android.com/guide/topics/usb/host.html
Also if you are working with something like an Arduino Board, and if your board has USB host capability, I would recomment using ADK for communication.
Related
I'm completely clueless on how to use BLE. I need to create an application for Android devices that sends a small string from one Android device to the other. I am NOT using any sensor type devices. I only need to send a string from one phone to another phone using a BLE connection. From what I understand, I need to create a custom service and implement a GATT server on a central device and have a peripheral device access it as a client but I'm not even sure if that's what I need for my situation. I have scoured the internet and nothing I have found deals with this topic specifically. I have no idea how to create a GATT server for this purpose and what I need to include in order to create a service. Can someone please explain to me what I need to do or point me towards some resources that are useful for A COMPLETE NOVICE? Thanks.
You are right so far. You need to create two applications on two different Android devices as follows:-
Android App A on Device #1: An app to act as a GATT Server to host your data that you want to send. For that, you will need GATT Server API.
Android App B on Device #2: An app to act as a GATT Client to connect to Device #1 and read the string data from the GATT Server using GATT Client API.
BLE is a relatively complex technology but luckily there are so many resources to help you get started. I recommend that you first understand how BLE technology works and for that I the following links are useful:-
Introduction to BLE Video Series
The Basics of Bluetooth Low Energy
Introduction to BLE GATT
Getting Started with Bluetooth Low Energy
Getting Started with BLE GATT
Once you have a better understanding of the protocol, the following links are useful for understanding Android BLE development (in addition to the video posted in the comment):-
The Ultimate Guide to Android Bluetooth Low Energy
Getting Started with Bluetooth Low Energy in Android
How to use Android BLE to Communicate between Devices (With Examples)
However, before going through any of these, it's always a good idea to get a feel and practical understanding of how the technology works. For that I recommend using the nRF Connect Android app to connect and read data off devices. This way, you'll be able to relate to the new information and hopefully understand the new concepts easier.
I need to make communication between PC software (written in java) and android app over usb cable. The PC software will send some data (Strings) to Android app witch will accept those strings and do some action depending on the message received.
What is the best way to do this?
I am looking all over the internet and can't find any solution to this. If someone has example of this communication i would be very grateful.
I already done this communication over sockets, put i need to cover situation if there is no router or internet connection.
Thank you
Check following article. I guess similar question to your on SO.
If you want to communicate between Android USB device and some USB host you need to use the accessory mode (https://developer.android.com/guide/topics/connectivity/usb/). But this mode requires special driver support on the USB host side (which is your PC).
I add some detail to my question.
I receive on my Xbee device a flow of GPS coordinates but I'm unable to read and stock these data on a buffer.
My Xbee device is connected to my laptop on a usb serial port, that's why I want to create a program java to read and use my data flow sending by the serial port.
I'm searching on internet some code example or tutorials , without enought advices for my understanding, or I just find some dead projects.
I found that it's possible to use jssc library or javax.comm (but I can't download the javax.zip on sun). Do you know an other better USB API ? Could you help me to understand how I can manage to read and stock my Flow of GPS cordinate ?
Forget abut USB, it acts as transparent bridge. What you need is a way to read from the serial port. javax.comm is not (officially) available any more. I have been successfull dealing with the arduino serial port with the RXTX library.
First make sure you see the serial port on your dev machine. This might require to install a driver. Then use a terminal program to connect to the serial port.
Once this is working go on and get RXTX working.
Just in case: You can have only one connection at a time. Make sure that only one of IDE, terminal programm and RXTX is connecting to the serial port at the same time.
I am developing USB to serial app, where mobile will attached with USB hub, and this hub is connected with with other devices through CP2102 cable. I am able to identify all devices and can read and write also. But the problem is all have same Vendor and product ID and other information also. And USB port number is also changing if we disconnect and connect.
So is there any way to identify the attached devices. Let me know if any other information required here.
I am using this example for development.
http://code.google.com/p/usb-serial-for-android/
Take a look at AN721, there is a tool that goes with this document that Silicon Labs provides to so you can customize your device's VID and PID, serial number and device strings. Serial number might be the easiest way to make your development devices unique, if you change the VID/PID then you'll need to create a custom driver with those new settings to get your device back.
I have an old android phone (2.2) and I need to use it to transfer a (.tok) file to Basic Stamp micro RS232 using a USB-Serial converter in between. So bluetooth is out of question. My only option is to write to the USB port of my android and make the BS2 micro receive it.
I`ve never programmed Android so need some guidance as to how I do this, specially when my api level is 8. I need a simple program that reads a downloaded (from the processing local linux PC) file from sdcard and then send it to USB port without any processing. That file is then received by the RS232 port of bot.
Android 2.2 API does not have USB host capabilities.
Host capabilities was not made available until Android 3.1.
This means you can't write an android program on your v2.2 phone that will control the USB communication.
I'm also guessing that even if you did update your OS, the phone doesn't have a USB-A port necessary to power the bus.
no need "usb host", work an older android devices like 2.2 http://code.google.com/p/android-serialport-api/