Multiple bluetooth connection

Question

I want to connect 3 devices via bluetooth  My Droid must connect to 2 bluetooth devices   I  ve connected my Droid to 1 device using Bluetooth chat How should I modify it for multiple bluetooth devices  Could you help me please

User · Answer

Not exactly true -- take a look at the specs summary

Logical link control and adaptation protocol (L2CAP)

L2CAP is used within the Bluetooth protocol stack. It passes packets to either the Host Controller Interface (HCI) or on a hostless system, directly to the Link Manager/ACL link. L2CAP's functions include:

Multiplexing data between different higher layer protocols.
Segmentation and reassembly of packets.
Providing one-way transmission management of multicast data to a group of other Bluetooth devices.
Quality of service (QoS) management for higher layer protocols.

L2CAP is used to communicate over the host ACL link. Its connection is established after the ACL link has been set up.

User · Answer

Have you looked into the BluetoothAdapter Android class   You set up one device as a server and the other as a client   It may be possible  although I haven t looked into it myself  to connect multiple clients to the server   I have had success connecting a BlueTooth audio device to a phone while it also had this BluetoothAdapter connection to another phone  but I haven t tried with three phones   At least this tells me that the Bluetooth radio can tolerate multiple simultaneous connections

User · Answer

You can take a look here   this is not a solution but the idea is here   sample multi client with the google chat example  what you have to change do      separate server and client logique in different classes for the client you need an object to manage one connect thread and on connected thread for the server you need an object to manage one listening thread per client  and one connected thread per client the server open a listening thread on each UUID  one per client  each client try to connect to each uuid  the uuid already taken will fail the connection    first come first served    Any question

User · Answer

Please take a look at the Android documentation   Using the Bluetooth APIs  an Android application can perform the following    Scan for other Bluetooth devices Query the local Bluetooth adapter for paired Bluetooth devices Establish RFCOMM channels Connect to other devices through service discovery Transfer data to and from other devices  Manage multiple connections

User · Answer

I was searching a way to connect 4 devices with bluetooth and I found the following   http   groups google com group android-developers browse thread thread 69d7810f6ef9bb7d  I m not sure that this is what you want    But in order to connect more than 2 devices using bluetooth you have to create a different UUID for each device you want to connect   Follow the link to see code examples and a better explanation

User · Answer

Yes  your device can simultaneously connect to 7 other Bluetooth devices at the same time  in theory  Such a connection is called a piconet  A more complex connection pattern is the scatternet    The reason it is limited to 7 other devices is because the assigned bit field for LT ADDR in L2CAP protocol is only 3

User · Answer

You can try my lib for multiple bluetooth connection    http   arissa34 github io Android-Multi-Bluetooth-Library

User · Answer

Two UE Boom Bluetooth speakers can form a stereo  which means the phone can stream simultaneously to two Bluetooth devices  The reason is Bluetooth 4 0  can support up to two synchronous connection oriented  SCO  links on the same piconet  and A2DP is based on SCO link   Your demand  bluetooth chat  is based on SPP profile  and SPP is based on RFCOMM protocol  Luckily even Bluetooth 2 1 can support multiple RFCOMM channels  so yes  you can have multiple bluetooth connection to chat with each other

[android] Multiple bluetooth connection

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