munin-miflora: refactor helper into common, add RSSI and timing metrics

common/misc.go

@@ -0,0 +1,14 @@
+package common
+
+import (
+	"regexp"
+	"strings"
+)
+
+const peripheralAddressAllowedChars = "[^a-z0-9]+"
+
+var peripheralAddressAllowedCharsPattern = regexp.MustCompile(peripheralAddressAllowedChars)
+
+func MifloraGetAlphaNumericID(peripheralAddress string) string {
+	return peripheralAddressAllowedCharsPattern.ReplaceAllString(strings.ToLower(peripheralAddress), "")
+}