- #WINDOWS BLUETOOTH STACK HOW TO#
- #WINDOWS BLUETOOTH STACK SERIAL#
- #WINDOWS BLUETOOTH STACK SOFTWARE#
- #WINDOWS BLUETOOTH STACK PC#
This allows you to develop and debug your applications in an environment with all the usual debugging facilities.
#WINDOWS BLUETOOTH STACK PC#
You can run your BlueLab applications on a PC under a debugger. Your applications will run under an interpreter called the Virtual Machine (VM) which will safeguard the Bluetooth protocol stack, allowing it to keep its prequalified status. You just have to write applications to run on top of RFCOMM. The BlueCore Bluetooth stack takes care of managing RFCOMM links.
#WINDOWS BLUETOOTH STACK HOW TO#
This chapter has shown how to create, debug, and download embedded applications for the BlueCore single chip Bluetooth device. Connections to each protocol layer must be made in turn from lowest to highest. Once a remote device has connected to a local device and found a service in the service database that it wants to connect to, attributes in the service record provide the information on the upper layers required to use the service and how to connect to them. Service discovery can be complex, but the Bluetooth profiles detail most of the attributes that should be stored in a service record. The SDP layer can always be found in the same place, above L2CAP. Remote devices can then connect to this database and use the Service Discovery Protocol (SDP) to query it. Each Bluetooth application must maintain an accurate record of the services it offers in a service discovery database.
#WINDOWS BLUETOOTH STACK SERIAL#
The Bluetooth specification describes several different types of layers above L2CAP, including RFCOMM for serial port emulation, and TSC-BIN for telephony profiles.ĭifferent Bluetooth devices support different profiles and offer different services. The actual L2CAP channels each have unique Channel Identifiers (CIDs). Data traffic from several upper layers is multiplexed through the Logical Link Control and Adaptation Protocol (L2CAP), which identifies upper layer types by their Protocol Service Multiplexor (PSM) values. Audio is routed directly over the HCI interface. The HCI transport provides a standardized interface to the Bluetooth integrated circuit (IC).
#WINDOWS BLUETOOTH STACK SOFTWARE#
While a Bluetooth service is being used, the complexities of the air interface are hidden by abstracting the interface across a number of software layers. The Bluetooth specification places limits on Page Scan to allow a good chance of connection while keeping power consumption low.ĭevices are usually in Page Scan only (connectable but not discoverable), or Page and Inquiry Scan (connectable and discoverable). Only devices that are in Page Scan mode can be connected to, but devices in Page Scan may reject an incoming connection request if they choose. This is similar to inquiry in that one device transmits while the other listens and then responds. Once two devices have found each other, they use a paging procedure to connect. Increasing the duty cycle reduces latency, but increases power consumption. The specification details timing restrictions on Inquiry and Inquiry Scan designed to ensure that devices have the best chance possible of discovering each other, while still allowing a low duty cycle and hence, minimal power consumption. A device must be in Inquiry Scan mode to be discoverable. One device discovers another by sending out inquiry transmissions, while the other listens for these inquiries and replies to them. Before connections can be made between devices, they must find each other. The Bluetooth stack does a good job of hiding the complexities of a wireless interface, but some peculiarities are still apparent. In Bluetooth Application Developer's Guide, 2002 Summary