Set BLE connect timeout

schef · April 27, 2020, 10:43am

Hi guys…
Is it possible to set a connect timeout when trying to use device as a central?
I have NRF52840 Dev kit and mbed-os-5.15.2 with "target.features_add": ["BLE"].

The issue that I am currently experiencing is that when there is no device in proximity the connect attempt never times out or at least i am not notified about it. So i tried to use cancelConnect() to stop the connection but instead after it when i turn on the device it connects without me wanting it to.

Is it possible to set connect timeout to 10s?
What do you suggest for alternative solution?

Thanks

sayhuthut · April 28, 2020, 9:20am

Hi Stjepan,

I think you need to set scan_duration.

schef · April 28, 2020, 9:34am

I can’t find the duration field in connection parameters.

github.com

ARMmbed/mbed-os/blob/5.15.2/features/FEATURE_BLE/ble/gap/ConnectionParameters.h#L174


      
           *
           * @param phy PHY being configured.
           * @param scanInterval Interval between two scans.
           * @param scanWindow Scan duration within a scan interval.
           *
           * @note It is useless to configure the 2M PHY because it is not used during
           * scanning.
           *
           * @return A reference to this.
           */
          ConnectionParameters &setScanParameters(
              phy_t phy,
              scan_interval_t scanInterval,
              scan_window_t scanWindow
          );
          
          
/**
           * Set the conenction parameters of a given PHY.
           *
           * @param phy The PHY being configured.
           * @param minConnectionInterval Minimum connection interval.

sayhuthut · April 29, 2020, 2:22am

The duration is passed in startScan()

github.com

ARMmbed/mbed-os/blob/bacf37894945a5c9b7619b709eeabeeb68d25d9c/features/FEATURE_BLE/ble/gap/Gap.h#L774


      
          
          
    /*                                     scanning                                              */
          #if BLE_ROLE_OBSERVER
              /** Set new scan parameters.
               *
               * @param params Scan parameters, @see GapScanParameters for details.
               * @return BLE_ERROR_NONE on success.
               */
              ble_error_t setScanParameters(const ScanParameters &params);
          
          
    /** Start scanning.
               *
               * @param duration How long to scan for. Special value 0 means scan forever.
               * @param filtering Filtering policy.
               * @param period How long to scan for in single period. If the period is 0 and duration
               *               is nonzero the scan will last for single duration.
               *
               * @note When the duration and period parameters are non-zero scanning will last for
               * the duration within the period. After the scan period has expired a new scan period
               * will begin and scanning. This will repeat until stopScan() is called.
               *

schef · April 29, 2020, 11:18am

Thanks for your replay.
I connect directly using connect method which for argument takes mac address without scanning although i think that connect internally uses scan to find the device.

What would i gain if i would scan first?

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Set BLE connect timeout

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