How does the peripherals reconnect to central board when the BLE connection lost

Hello everyone, I am developing a system with multiple peripherals to a central board. How many peripherals can keep connecting with central at one time? I made some peripherals connected to a central board but after several hours, the connection of some peripherals lost and cannot reconnect to the BLE network. How can the peripherals reconnected to the central board? I have enlarge the timeout to 20s but it doesn't work. Any help will be appreciated. 

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