LYWSD03MMCの温度湿度バッテリ電圧をgattoolで取得するシェルスクリプト(0度以下は未対応) オリジナル：http://www.d0wn.com/using-bash-and-gatttool-to-get-readings-from-xiaomi-mijia-lywsd03mmc-temperature-humidity-sensor/

LYWSD03MMC.sh

#!/bin/bash

if [ -z "$1" ]; then
    echo "Usage: $0 [Bluetooth MAC Addr]"
    exit 1
else
    MAC=$1
fi

#bt=$(timeout 15 gatttool -b A4:C1:38:8E:1D:8E --char-write-req --handle='0x0038' --value="0100" --listen)
bt=$(timeout 12 gatttool -b $MAC --char-write-req --handle='0x0038' --value="0100" --listen|awk -F 'value: ' '{print $2}')
if [ -z "$bt" ]; then
    echo "The reading failed"
else
    temphexa=$(echo $bt | awk -F ' ' '{print $2$1}'| tr [:lower:] [:upper:] )
    temperature100=$(echo "ibase=16; $temphexa" | bc)
    temperature=`echo "scale=2;$temperature100/100"|bc`
    echo "temperature=$temperature"
    humhexa=$(echo $bt | awk -F ' ' '{print $3}'| tr [:lower:] [:upper:])
    humidity=$(echo "ibase=16; $humhexa" | bc)
    echo "humidity=$humidity"
    batteryhexa=$(echo $bt | awk -F ' ' '{print $5$4}'| tr [:lower:] [:upper:] )
    battery1000=$(echo "ibase=16; $batteryhexa" | bc)
    battery=`echo "scale=3;$battery1000/1000"|bc`
    echo "voltage=$battery"
fi