Server architecture of pet project I was part of at Yandex Tolstoy Camp.

1. Context diagram
Bluetooth/WiFi Direct connection
Internet connection
GSM/Internet station with a range

2. Server architectural drivers
Functional requirements
• Connect clients based on their location
• Pass messages between clients when they can not use bluetooth
for communication
Quality attributes
• Availability - clients should be processed despite the fact that they
might have loosely and interruptible connection
• Scalability - service should be resistible to short term load peaks
Constraints
• Business
1. Connect only clients in the X range between each other
2. Server should not process contents of messages
• Technical
1. Java, ProtoBuf, Netty were chosen to use
2. Clients are iPhone and Android devices that communicate via bluetooth
and direct WiFi between each other

3. Physical view

4. Sequence diagram

5. Server dynamic (runtime) view

6. Server static view