The documentation for this gateway suggests it supports Bluetooth 4.2, but the gateway itself seems to be limited to 4.1, in particular the LE Data Packet Length Extension feature doesn't seem to be supported. (I think that makes the gateway comparable to the 3B, rather than the 3B+)
Is this something that could be fixed with a firmware update for the BCM43438? There's conflicting information on what's supported by various versions of this chip from Broadcom and Cypress.
Thanks.