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Ideally there should not be any limit other than memory constraint.
Our FW implementation allows theoretically max 15 LE connections from link management viewpoint. However, the actual use case will be more dependent on the connection interval, length of connection event, connection role and what other BT and BLE activities are going on.
Since CYW43012 is not a broad-market chip, it is not supported here on Cypress Community. Please get in touch with the local Cypress Sales/FAE team for more support on this.