diff --git a/observer/messages/collector.go b/observer/messages/collector.go
new file mode 100644
index 0000000..ec43be6
--- /dev/null
+++ b/observer/messages/collector.go
@@ -0,0 +1,11 @@
+package messages
+
+const (
+	COLLECTOR_STARTED = "COLLECTOR_STARTED"
+	COLLECTED         = "COLLECTED"
+	COLLECTOR_STOPPED = "COLLECTOR_STOPPED"
+
+	ADD_SENSOR    = "ADD_SENSOR"
+	UPDATE_SENSOR = "UPDATE_SENSOR"
+	REMOVE_SENSOR = "REMOVE_SENSOR"
+)
diff --git a/observer/messages/commons.go b/observer/messages/commons.go
new file mode 100644
index 0000000..6ba4799
--- /dev/null
+++ b/observer/messages/commons.go
@@ -0,0 +1,5 @@
+package messages
+
+const (
+	API_SERVER_INFO = "API_SERVER_INFO"
+)
diff --git a/observer/messages/data_sender.go b/observer/messages/data_sender.go
new file mode 100644
index 0000000..468c045
--- /dev/null
+++ b/observer/messages/data_sender.go
@@ -0,0 +1,3 @@
+package messages
+
+const ()
diff --git a/observer/messages/poller.go b/observer/messages/poller.go
new file mode 100644
index 0000000..27041da
--- /dev/null
+++ b/observer/messages/poller.go
@@ -0,0 +1,9 @@
+package messages
+
+const (
+	POLLER_STARTED = "POLLER_STARTED"
+	NEW_CONF_FOUND = "NEW_CONF_FOUND"
+	POLLER_STOPPED = "POLLER_STOPPED"
+
+	UPDATE_POLLING_INTERVAL = "UPDATE_POLLING_INTERVAL"
+)