https://devzone.nordicsemi.com/f/nordic-q-a/56886/ios-queued-writesI have a characteristic with variable length and max length of NRF_SDH_BLE_GATT_MAX_MTU_SIZE - 3 i.e. the max possible data length based on the max MTU. During connection the max data length is negotiated to 251. However, iOS returns 512 from maximumWriteValueLengthen-USTelligent Community 13Fri, 24 Jan 2020 14:44:37 GMThttps://devzone.nordicsemi.com/thread/230902?ContentTypeID=1Fri, 24 Jan 2020 14:44:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c85e102e-01c7-40cc-b245-e90fee41097eAleksander Nowakowski<p>You need to use write without response. Pass this write your to&nbsp;<span>maximumWriteValueLength and use it also for writing.</span></p><div style="clear:both;"></div>