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nrf 8001 + Arduino Notify Questions

Hello i have a system that build in an ultrasonic sensor RedBearLab BLE Shield ( nrf8001 ) and arduino i want to get ultrasonic data via bluetooth and see it on nRFConnect i can see it but when i try to cut the notify command by clicking the notify button i saw an error which is "ACI Evt Pipe Error: Pipe #:6 Pipe Error Code: 0x96" Pipe 6 is the notify pipe for ultrasonic sensor data and in the datasheet the error refer to ACI_STATUS_ERROR_PIPE_STATE_INVALID , Pipe Error Event: Pipe state invalid for the selected operation , how can i fix that problem ? and another question is i have a button on my system and when i press button i want to see 1 on notify screen and i can see it but i cannot see the sensor data notify and button notify at the same time is there any advice for it ?

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