calculate rms using sox on 1s audio snippets

I'm using this to monitor rotation of (unused!) 220v fan to capture
it's rotation and have indication of air movement

diff --git a/audio2mqtt.sh b/audio2mqtt.sh
new file mode 100755 (executable)
index 0000000..cb7e9f5
--- /dev/null
+++ b/audio2mqtt.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+while true ; do
+
+arecord -d 1 -r 96000 /dev/shm/tmp.wav
+time=`date +'%s%N'`
+info=`sox /dev/shm/tmp.wav -n stat 2>&1 | sed -e 's/(.*)//' -e 's/: */=/' -e 's/  */_/g' | tr '\n' ',' | sed 's/,$//'`
+curl --silent -XPOST http://10.60.0.92:8086/write?db=rot13 --data-binary "fan,dc=trnjanska $info $time"
+
+done