bolus ack

[bewest]

mmeowlink and Carelink stick do slightly different things:

• Carelink always returns a payload, even when no payload exists, apparently to convey error status?
• Mmeowlink exposes the acks per frame, but we observe no payload in the RF, therefore we generate a fictitious 64 byte null payload.

I've seen following successful fictious payloads from Carelink usb: 0x00 0x00 0x00 0x0c 0x00 0x0c

I've seen the following unsuccessful failure payloads from Carelink usb (eg exceeding the max bolus limit): 0x09 0x09 0x09

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Please do special testing on this, it's related to https://github.com/openaps/decocare/issues/4