My feeling is that manufacturing a set of relays that interface with today's existing wired smoke detectors and CO detectors would make a lot more sense. Added complexity will almost always make these devices harder to use and less reliable.
Keep the existing devices and make a gadget that uses wifi (optionally ethernet or a mesh network? a cell modem?) and relies on the signal old school 3-wire or 4-wire smoke detectors already put out. With a three-wire system, for example, you could put one relay in and get a cell warning for the entire system or put a relay on each alarm and get zone-specific alarms.
The trouble is that the sorts of people thinking about these things want to rope the customer into a proprietary system instead of just sending them an email or SMS with the cheapest possible equipment.
Keep the existing devices and make a gadget that uses wifi (optionally ethernet or a mesh network? a cell modem?) and relies on the signal old school 3-wire or 4-wire smoke detectors already put out. With a three-wire system, for example, you could put one relay in and get a cell warning for the entire system or put a relay on each alarm and get zone-specific alarms.
The trouble is that the sorts of people thinking about these things want to rope the customer into a proprietary system instead of just sending them an email or SMS with the cheapest possible equipment.