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I'm currently trying to develop a l2cap demo application where I want to send data to a bluetooth chip over l2cap. I'm able to send several packet from the iPhone to the bluetooth chip. The chip send back credits and the iPhone continue to send data. After a moment suddenly the outputstream crash and rise a error that I'm not able to interpret. here is the error raised : /Users/13fmeyer/Documents/Screenshot 2024-05-07 at 15.15.37.png Here is the section of the code that manage the write : /Users/13fmeyer/Documents/Screenshot 2024-05-07 at 15.16.49.png and the write method : /Users/13fmeyer/Documents/Screenshot 2024-05-07 at 15.17.20.png Finally it close the act connection and stop the transmission. Does somebody have any idea about what happen ?