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How to know the central and peripheral are still connected

Hi everybody!!!

I am making a project which use NUS service and I have confuses in connection mode:

  • when the central and peripheral do not have data to transfer in connection mode, the system will go to sleep mode or not?.

  • If yes, how to check the connection is still on?.

  • If no, how can I put the system to sleep mode if there is no data transfer for long time ? And how to wake up without using any interupts(GPIO, UART, I2C.. ) except WDT?

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