Sending basic update messages to pebble from an openaps rig

When using Medtronic CGM (without an additional device to see BG) it gives the patient a practical way to stay on top of key information without the hassle of accessing the pump.

Particularly useful when offline or if opening NightScout is not practical or desired for any reason

Tested so far with an Edison/Explorer rig

Messages are received in the pebble as notifications

Takes advantage of small pebble displays such as newer timeround models

Meant to be added as a cronjob every 5 min (or as often as you want, I am testing with 1 min updates)

In the pebble you can define how many minutes the message stays current. After that time (I have it as 3 min for now), the watch sends you to the updates list, where you can scroll down through previous messages. This functionality gives you a quick way to know if your data is current and also to explore recent values.

I am in the initial testing and iterating of this idea

The intended message in the pebble contains two lines:

    Line 1: BG(BG Delta)/IOB/Temp Basal
    Line 2: BG time, then between parenthesis the time elapsed from BG time to now expressed in minutes

Example below:

    ----------
    82(-1)/-0.5/0.0
    10:27 (1m)
    ----------

If the time elapsed from the last BG time is more than 15 minutes (normally glucose data in Openaps is updated every 5 min) the message will be different:

    Line 1: Old Data: <Time elapsed from BG time to now expressed in minutes>
    Line 2: BG(BG Delta)/IOB/Temp Basal

Example below:

    ----------
    Old Data: 35m 
    82(-1)/-0.5/0.0
    ----------

#Dependencies:

Openaps

Bluez

    sudo apt-get install bluez
    
    to pair your watch, look at section: "using bluetoothctl" of instructions in the next link
    https://wiki.debian.org/BluetoothUser

Libpebble2

    pip install libpebble2

#Run before sending messages to the pebble

    hciconfig hci0 up
    systemctl start bluetooth.service 
    rfcomm bind hci0 B0:B4:48:F4:F0:C5 #replace the MAC address with that of your pebble

Add as a startup script

#To do

Take advantage of Openaps Oref0 set up script to facilitate Bluetooth configuration