How to Seamlessly Pair Android to Multi-Transmitter Bluetooth Audio Module Without Selection

I'm working on a project where a module is suppose to stream an audio signal to multiple receivers via Bluetooth. To be able to connect more than 7 units to this device, I thought of using three Bluetooth transmitters. But when I pair my Android phone to this device, I don't want to have to select between the different Bluetooth units. I just want to be able to select the device and be paired with any of the available Bluetooth transmitter. Any idea of how this is achieved?

You will only be able to connect to one device at any time. If you wish to connect to a second device you must first disconnect from the device currently being used with the pairing device you can however pair to each one so that each bluetooth record is held by your unit using AD2P However you can still only ever connect to one device at a time and stream audio

But there are Bluetooth modules, using A2DP, that is capable of having up to seven connections!

Yes that’s true but you when they say up to seven connections they mean only one connection at a time this means you can hold a record of seven Bluetooth devices but you will only be able to have one stream at a time in progress In other words yu may hold seven addresses of seven independent Bluetooth devices but you can only stream one at a time

If I’m incorrect about this then apologies but that’s what I know of to date having written experimental software for Bluetooth devices and based on personal experience plus what i have read on the net Only one connection is ever possible because i looked into what you are wanting to do some time ago, approximately 2 years ago when I began programming in c sharp and went further than just networking

I also studied Bluetooth in java (J2ME) and the above language simply because at that time i became very interested in mobile applications with respect to automation and mobile phone hacking via Bluetooth plus my interest in audio and the realization that Bluetooth via smart phone to car radio / hifi was definitely a possible future in sound technology how ever A2DP was in its infancy stages then

So I may have missed something in between

Send me some data sheets if you have any

I can read through them and possibly explain this or maybe even learn something new because id be interested if there is such a device than can maintain 7 simultaneous streams

I would say currently , possibly if you multiplexed each stream then could i suppose be this could exist but at the end Bluetooth is point to point networking via RF (one TXRX pair )

The other reason why i was experimenting with Bluetooth at the time was again a realisation that your address book and personal details plus making another persons phone appear make a call was quite interesting the fact that you could connect to another phone then subsequently dial from the remote phone via your own with out a physical connection had its plus side plus more obviously a down side

I also looked heavily into using Pc to mobile phone via Bluetooth to attain remote control of a device and visa versa ( good idea for handicapped people ) use of mouse etc via mobile phone also remote control of wheel chairs etc ( has its good uses )

Again this has a plus side and a down side depends what you do with that type of knowledge as with anything else Could be good Could be bad its all about state of mind I guess and self consciousness not to mention how and what not to do

These days looking at newspapers and so forth it pays to know these things and more importantly how too equally how to prevent, depends on what circumstances

But like anything its entirely your choice at the end of the day although this could now play a significant role in security systems and access points entrance points Quiet a bright future in some resepects provided to also acknowledge its loopholes and ensure loopholes are covered when designing such systems Audio inclusive otherwise you might as well kiss your copyrights goodbye on music tracks if not secured properly ( down side of this privacy )

Bluetooth could have a significant impact on the defense however having looked into this quite significantly i would assume defense would opt for infra red which is direct line of sight , undetectable , cant see with the naked eye ideal for communications of great importance with respect to short distance

If i wanted to communicate in private with utmost secrecy Then i would not opt for Bluetooth but for emergency cases where remote control of appliances is concerned is has strong viability utilised with repeaters its very strong formidable solution close to that of cellular communications far better than that of wifi which can be seen by all

Could be quite usefull when terminating Night Rider alias Mark rolf and that awfull car !! god it could even be fun , he wont like that Mr Manering

Ok, you,re probably right about streaming to multiple devices isn't possible. But I was thinking that even if my Bluetooth transmitter isn't capable of sending data to multiple devices at the same time, it still can send data to every device, one at a time, in a very high speed. So you'll probably wont notice the tiny delays between the different receivers.
A person in an other forum told me yesterday that he once paired 6 receivers to his cellphone and was able to stream music to all of the receivers.

I was thinking of using a Bluegiga WT32 for my project. The number of connections depends on the firmware. You'll find datasheets in the following links:
http://www.avnet-embedded.eu/fileadmin/user_u...ireless/Bluegiga_BR_EDR_module_comparison.pdf
http://www.bluegiga.com/files/bluegiga/Pubfiles/WT32_Product_Brief_lores.pdf
http://www.sparkfun.com/datasheets/Wireless/Bluetooth/WT32_Datasheet-1.pdf

Interesting! Is it really that easy to hack Bluetooth? I thought the pairing made that difficult.
Luckily, I don't have to worry about security in my project.

Sending data to multiple devices is possible according to bluetooth.com:
"Each device in a piconet can also simultaneously communicate with up to seven other devices within that single piconet..."
www.bluetooth.com/Pages/Basics.aspx

On bluetooth.org I also found a White paper from 2008, that says it is possible to stream audio to multiple receivers. Look for "Usage of Multiple Headphones Whitepaper" at
https://www.bluetooth.org/Technical/Specifications/whitepapers.htm

Yes if you pair to devices then write software to run in the background yes its is that simple Question is do you ever know what’s running in the background of any software Answer No you never do not unless you have the software to hand and break it down to assembler level

Every programmer will tell you this

So if you are pairing to any Bluetooth device how do you ever know that’s trusted

You don’t next if you can hook into a a USB stream , TCP IP Stream , UDP what ever protocol you choose any other hardware software port and watch what commands are being sent to a modem for example , which i often do ,

It pays to know these things You even have to watch airtime providers network providers You always will have too That unfortunatley is why we have MI5 .MI6 They do it The newspapers do it The government do it , enginners will always do this and the armed forces , police , etc will also do this no matter where you go or what country That is all part of national security every now and again one of them gets caught out by someone else It becomes embarrising but its only embarrising because thier so called national security has been flawed which well just as well this does happen , but its constantly going on It always will ,reality Im afraid , sad fact of life

How do you know that cant be done with Bluetooth whilst on your phone ison which means your phone contstantly recieves and transmitts messages

Since a bluetooth record is left on your phone or the device your connecting too It remembers that as well Again even if you think you have overwritten the record very much the same as a hard drive They will always be able to recover the data

So there will be a way in make no mistake You may not be aware of this and they wont tell you this but they will have a backdoor in To not do so would be holy unwise , hence you will always have to have people that can hack That simple

What does that tell you Bluetooth is not secure even if you think your device is paired there is no way of ever telling what the airtime provider does or what’s hidden in the embedded software of your phone There never is and they will always have some back door in you can bet your life on that one

And here are some bluetooth hacks long known to most of us


http://hassam.hubpages.com/hub/Types-Of-Bluetooth-Hacks-And-Its-Security-Issues

So whilst you are operating your bluetooth via mobile or rf medium if there is another transport mechanism in place over and above blue tooth It will always be possible to hook in to that stream

Deep paranoia huh !! Enjoy , I just laugh at this

Rule of thumb is no public carrier medium is not watched even if its private or so they say it never is absolutley private It never will be no matter what they tell you

Next golden rule is if you have nothing to worry about then you need to be concerened because someone somewhere will always want to out smart you Thats human nature

In basic sumation " You are all Fooked !! " woucha !!

But then why worry I dont worry about this at all See depends how your mind works i guess