LAUNCHXL-CC26X2R1: "Connection Event" duration

Hi !

In BLE, the peripheral and the central exchange data during a connection event. These connections event last for a period of time which has no definitive name in the bluetooth specification. In the BLE user guide we refer to both as a connection event window

The anchor point is the "specific time" and the connection event window is the "specific time slot". While the connection interval, AKA the time between two anchor points, can be set by the user, the connection event window is defined by the central and peripheral when exchanging the CONNECT_IND and AUX_CONNECT_REQ PDUs. You can read more about it in the chapter 4.5.3 Connection event transmit window of the BLE Specification :

to allow the Central to efficiently schedule connection events for multiple
connections or other activities it may be involved in, the Central has the
flexibility to schedule the first connection event anchor point at a time of its
choosing. The CONNECT_IND and AUX_CONNECT_REQ PDUs include
parameters to determine when the Central sends its first packet in the
Connection State to set the anchor point and when the Peripheral listens.

The CONNECT_IND and AUX_CONNECT_REQ PDUs include three
parameters used to determine the transmit window. The transmit window starts
at transmitWindowDelay + transmitWindowOffset after the end of the packet
containing the CONNECT_IND PDU or AUX_CONNECT_REQ PDU, and the
transmitWindowSize parameter shall define the size of the transmit window.
The connInterval is used in the calculation of the maximum offset and size of
the transmit window. The transmitWindowOffset and transmitWindowSize
parameters are determined by the Link Layer

Kind regards,
Maxence