Figure out if the pressure sensor can be linked to the SCD30 via hardware or software only

[ezio-melotti]

The accuracy of the SCD30 can be increased by specifying a pressure value and the BNE668 is able to measure the pressure and provide this value.

We need to determine if the value can be provided directly to the SCD30 by physically connecting the two sensors or if it can only be set via software. If only the latter works, then we will need a way for the two sensor drivers to talk.

Perhaps the server can implement and event like msg-for that accepts the name of another client and an event, and redirects the message so that SCD30 could do sio.emit('msg-for', 'BNE668', 'get-pressure') and get back the pressure value from the BNE668 driver (see #11).

[GregRRoss]

I don't believe there is any way to do it via hardware.

I believe the best way to do it would be to retrieve recent pressure data from the database once it is implemented.

Some thoughts:

1. A pressure sensor may or may not be attached.
2. The pressure sensor could be one that is different from the BME688
3. There could be multiple pressures in the database so the correct location for the pressure must be determined.