add support for barometric pressure

internal/mqttingest/topic_match.go

@@ -0,0 +1,36 @@
+package mqttingest
+
+import "strings"
+
+// TopicMatches reports whether a topic filter (with + or # wildcards) matches a topic name.
+// It follows the MQTT v3.1.1 wildcard rules and supports shared subscriptions ($share).
+func TopicMatches(filter, topic string) bool {
+	return matchTopic(routeSplit(filter), strings.Split(topic, "/"))
+}
+
+func matchTopic(route []string, topic []string) bool {
+	if len(route) == 0 {
+		return len(topic) == 0
+	}
+	if len(topic) == 0 {
+		return route[0] == "#"
+	}
+	if route[0] == "#" {
+		return true
+	}
+	if route[0] == "+" || route[0] == topic[0] {
+		return matchTopic(route[1:], topic[1:])
+	}
+	return false
+}
+
+// routeSplit removes $share/group/ when matching shared subscription filters.
+func routeSplit(route string) []string {
+	if strings.HasPrefix(route, "$share/") {
+		parts := strings.Split(route, "/")
+		if len(parts) > 2 {
+			return parts[2:]
+		}
+	}
+	return strings.Split(route, "/")
+}