getDeviceList doesn't bring back all devices

[ProfDeCube]

We have 28 blinds/blind combinations set up using remotes that are paired to our hub, and using a python script we see all of them, however this node implementation seems to limit what comes back, only presenting 16 of the 28 devices (including the hub)

[jhurliman]

I audited the protocol and receive path while preparing #14. There is no intentional 16-device cap, and a real local UDP fixture now exercises discovery plus status reads for 28 devices. The PR also fixes overlapping request callbacks and filters packets from other gateways. That does not establish the cause of the hardware report, so I am leaving this open. To narrow it down, useful details are the gateway model/firmware, whether one or several gateways are present, and the count of device entries in each GetDeviceListAck versus the count returned by readAll(). Please omit access tokens, keys, and account information from any diagnostics.