https://devzone.nordicsemi.com/f/nordic-q-a/15740/unable-to-update-connection-parameterHi all, I want to update my connection parameter as follow: #define MIN_CONN_INTERVAL MSEC_TO_UNITS(7.5, UNIT_1_25_MS) //400 /**&lt; Minimum acceptable connection interval (0.4 seconds). */ #define MAX_CONN_INTERVAL MSEC_TO_UNITS(40, UNIT_1_25_MSen-USTelligent Community 13Wed, 17 Aug 2016 11:52:39 GMThttps://devzone.nordicsemi.com/thread/60088?ContentTypeID=1Wed, 17 Aug 2016 11:52:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:705dd265-34a3-4470-8d00-c9b9212d86d0Petter Myhre<p>That is not supported by our SoftDevices (or BLE), you can however try with MIN=MAX=7.5ms first, if that gets rejected you can increase it to MIN=MAX=10 ms, or MIN=MAX=20 ms.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/60090?ContentTypeID=1Tue, 16 Aug 2016 13:22:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:352f9a7c-959f-4653-8c07-ded403af3ceaDeepak Kumar<p>I cannot put MIN=MAX because we want my Bluetooth to connect with both Windows and MAC. if i put MIN=MAX then Bluetooth will connect only on that interval and i will not have a range where central can negotiate with peripheral.</p> <p>can you tell me if it is possible to update my parameter with a particular interval while keeping my range MIN=7.5 and MAX=40.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/60089?ContentTypeID=1Tue, 16 Aug 2016 12:28:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b02e6db1-cad2-4517-9331-f07db4324ccdPetter Myhre<p>You can set MIN = MAX, but be aware that it is the central that dictates the connection interval, the peripheral can only request.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/60093?ContentTypeID=1Tue, 16 Aug 2016 08:18:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:91555bc6-0b62-4c45-942d-ef40edb1b56cDeepak Kumar<p>Hi Petter, My device is not specific with apple devices only. I want to connect it with Windows and Android also. iOS devices cannot accept 7.5ms but Android and Windows may accept this connection parameter. Is it possible to update my connection parameter with a specific number, say 7.5ms or 10ms, separately without considering about the range in MIN and MAX connection interval.  (I can give the MIN and MAX connection intervals as 7.5 and 40)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/60092?ContentTypeID=1Tue, 16 Aug 2016 06:43:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b20678c9-714d-4716-9328-452e543be536Petter Myhre<p>7.5 ms is not possible with Apple devices, 20 ms is minimum, as you can see from the document:</p> <p>Interval Min ≥ 20ms</p> <p>11.25 ms is achievable if you have a HID device.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/60091?ContentTypeID=1Tue, 16 Aug 2016 06:21:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e93f8a4e-6978-4399-b820-9e12d24b2d11Deepak Kumar<p>Hi Petter, Is it possible to update my connection parameter with 7.5ms. while keeping my MIN_CONN_INTERVAL=7.5 and MAX_CONN_INTERVAL=40. after connection.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/60087?ContentTypeID=1Mon, 15 Aug 2016 13:03:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a244c9da-0c13-4161-a726-5a7fa280ec78Petter Myhre<p>With Apple devices the <a href="https://developer.apple.com/hardwaredrivers/BluetoothDesignGuidelines.pdf">Bluetooth Accessory Design Guidelines for Apple Products</a> must be followed.</p> <p>See section 3.6 for connection parameters.</p><div style="clear:both;"></div>