tedge-agent skip legacy topic subscription when running as a child de…

…vice

Signed-off-by: Reuben Miller <[email protected]>

crates/core/tedge_agent/src/agent.rs

@@ -280,9 +280,6 @@ impl Agent {
             &self.config.service,
         );
 
-        // Tedge to Te topic converter
-        let tedge_to_te_converter = create_tedge_to_te_converter(&mut mqtt_actor_builder)?;
-
         let mut fs_watch_actor_builder = FsWatchActorBuilder::new();
         let mut downloader_actor_builder = DownloaderActor::new(
             self.config.identity.clone(),
@@ -347,6 +344,8 @@ impl Agent {
         if is_main_device {
             info!("Running as a main device, starting tedge_to_te_converter and File Transfer Service");
 
+            // Tedge to Te topic converter
+            let tedge_to_te_converter = create_tedge_to_te_converter(&mut mqtt_actor_builder)?;
             runtime.spawn(tedge_to_te_converter).await?;
 
             let file_transfer_server_builder =

tests/RobotFramework/tests/tedge_agent/tedge_agent_as_child.robot

@@ -14,6 +14,12 @@ Run agent with a custom topic prefix #3031
     Should Not Contain    ${output}    te/
     Should Contain    ${output}    custom_root/device/customname//
 
+tedge-agent should not subscribe to legacy topics when running as a child device #3034
+    # Only run tedge-agent for a few seconds
+    ${output}=    Execute Command    timeout 5 tedge-agent --mqtt-device-topic-id "device/pump//" 2>&1    ignore_exit_code=${True}
+    Should Contain    ${output}    Running as a child device, tedge_to_te_converter and File Transfer Service disabled
+    Should Not Contain    ${output}    item=${SPACE}tedge/
+
 
 *** Keywords ***