I want to try to create a client server on android via bluetooth, but nowhere could I find the exact information how many android devices (clients) at the same time I can connect to one (server).
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1 answer
The Bluetooth channel is able to connect two devices to each other. The one that initiates the connection and works as a master (Master) can interact with a maximum of seven dependent (Slave). For example, a cell phone as a master device can synchronize data with a computer and simultaneously send photos to a Bluetooth printer. True, a computer as a slave in such a hierarchy will not be able to access the printer, although they are on the same network: it will need to establish a new connection to the printer as a Master device.
A WLAN can include 25–30 devices. For Bluetooth, the maximum is 8. However, at the same time, more than 200 “passive” devices can be simultaneously in the Bluetooth network; each of them will be activated within a few milliseconds if one of the active Slave devices releases the connection and receives a request from the Master device.
Bluetooth uses narrower frequency corridors, and the transition from one channel to another with a connection occurs at a frequency of 1600 times per second. This frequency hopping makes Bluetooth less sensitive to external influences, since when interference occurs, the connection will be on the “critical” frequency for only a short time. Due to this, up to 10 Bluetooth networks can work in close proximity to each other.
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