Editing Bluetooth (section)

=== Communication and connection ===
A master BR/EDR Bluetooth device can communicate with a maximum of seven devices in a piconet (an ad hoc computer network using Bluetooth technology), though not all devices reach this maximum. The devices can switch roles, by agreement, and the slave can become the master (for example, a headset initiating a connection to a phone necessarily begins as master—as an initiator of the connection—but may subsequently operate as the slave).

The Bluetooth Core Specification provides for the connection of two or more piconets to form a [[scatternet]], in which certain devices simultaneously play the master/leader role in one piconet and the slave role in another.

At any given time, data can be transferred between the master and one other device (except for the little-used broadcast mode). The master chooses which slave device to address; typically, it switches rapidly from one device to another in a [[round-robin scheduling|round-robin]] fashion. Since it is the master that chooses which slave to address, whereas a slave is (in theory) supposed to listen in each receive slot, being a master is a lighter burden than being a slave. Being a master of seven slaves is possible; being a slave of more than one master is possible. The specification is vague as to required behavior in scatternets.<ref>{{Cite journal |last3=Patil |last2=Koul |last1=Kurawar |first3=Viki Tukaram |first2=Ayushi |first1=Arwa |date=August 2014 |title=Survey of Bluetooth and Applications |journal=International Journal of Advanced Research in Computer Engineering & Technology |volume=3 |pages=2832–2837 |issn=2278-1323}}</ref>