This is a small utility for scanning Bluetooth Low Energy (BLE) Advertisements from Ruuvi sensors and dumping the values as JSON to standard output.
Grab a precompiled release or use the Go toolchain.
Set the environment value VERBOSE=1 if you wish to see more details when a
RuuviTag Advertisement is received.
$ ./ruuviscan \
| jq -rc 'select(.Temperature.Valid) | [.Timestamp, .MAC, .Temperature.Value] | @tsv'
First create a suitable database file with a table for temperature data:
$ sqlite3 temps.db <<'EOF'
CREATE TABLE temps (
timestamp TIMESTAMP NOT NULL,
mac STRING NOT NULL,
temp REAL NOT NULL
)
EOF
Then you can run the program to scan and store for the values:
$ ./ruuviscan \
| jq --unbuffered -rc \
'select(.Temperature.Valid) |
[.Timestamp, .MAC, .Temperature.Value] | @sh' \
| while read -r _ts _mac _temp; do
sqlite3 temps.db "INSERT INTO TEMPS VALUES ($_ts, $_mac, $_temp)"
done
You may also observe the latest values as they are recorded:
$ watch sqlite3 --readonly \
"temps.db \
'SELECT COUNT(*) FROM temps;
SELECT * FROM temps ORDER BY timestamp DESC LIMIT 10;'"
See temps.plt for an example how to plot the temperature data with gnuplot.