diff --git a/app/src/main/java/jp/juggler/subwaytooter/Column.kt b/app/src/main/java/jp/juggler/subwaytooter/Column.kt
index 13efcb82..b68bb4ca 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/Column.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/Column.kt
@@ -590,6 +590,7 @@ class Column(
         }
 
         override fun onTimelineItem(item: TimelineItem, channelId: String?, stream: JsonArray?) {
+            if(StreamManager.traceDelivery) log.v("${access_info.acct} onTimelineItem")
             if (!canHandleStreamingMessage()) return
 
             when (item) {
@@ -2780,13 +2781,13 @@ class Column(
     fun canStartStreaming() = when {
         // 未初期化なら何もしない
         !bFirstInitialized -> {
-            log.v("canStartStreaming: column is not initialized.")
+            if(StreamManager.traceDelivery) log.v("canStartStreaming: column is not initialized.")
             false
         }
 
         // 初期ロード中なら何もしない
         bInitialLoading -> {
-            log.v("canStartStreaming: is in initial loading.")
+            if(StreamManager.traceDelivery) log.v("canStartStreaming: is in initial loading.")
             false
         }
 
diff --git a/app/src/main/java/jp/juggler/subwaytooter/streaming/StreamConnection.kt b/app/src/main/java/jp/juggler/subwaytooter/streaming/StreamConnection.kt
index 4e9f3104..2068ba37 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/streaming/StreamConnection.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/streaming/StreamConnection.kt
@@ -81,6 +81,7 @@ class StreamConnection(
         item:TimelineItem?=null,
         block: (callback: StreamCallback) -> Unit
     ) {
+        if(StreamManager.traceDelivery) log.v("$name eachCallback spec=${spec?.name}")
         if (spec != null) {
             eachCallbackForSpec(spec,channelId,stream,item,block)
         }else {
@@ -103,6 +104,7 @@ class StreamConnection(
 
     private fun fireTimelineItem(item: TimelineItem?, channelId: String? = null,stream:JsonArray?=null) {
         item?:return
+        if(StreamManager.traceDelivery) log.v("$name fireTimelineItem")
         eachCallback(channelId,stream,item=item) { it.onTimelineItem(item, channelId,stream) }
     }
 
@@ -184,7 +186,7 @@ class StreamConnection(
                 fireTimelineItem(acctGroup.parser.notification(body), channelId)
             }
 
-            else -> log.v("$name ignore streaming event $type")
+            else -> log.w("$name ignore streaming event $type")
         }
 
     }
@@ -195,7 +197,7 @@ class StreamConnection(
 
         when (val event = obj.string("event")) {
             null, "" ->
-                log.d("$name onMessage: missing event parameter")
+                log.d("$name handleMastodonMessage: missing event parameter")
 
             "filters_changed" ->
                 Column.onFiltersChanged(manager.context, acctGroup.account)
@@ -254,7 +256,7 @@ class StreamConnection(
 
     override fun onMessage(webSocket: WebSocket, text: String) {
         manager.enqueue {
-            log.v("$name WebSocket onMessage.")
+            if(StreamManager.traceDelivery) log.v("$name WebSocket onMessage.")
             try {
                 val obj = text.decodeJsonObject()
                 when {
@@ -263,7 +265,7 @@ class StreamConnection(
                 }
             } catch (ex: Throwable) {
                 log.trace(ex)
-                log.e("data=$text")
+                log.e("$name onMessage error. data=$text")
             }
         }
     }
diff --git a/app/src/main/java/jp/juggler/subwaytooter/streaming/StreamGroup.kt b/app/src/main/java/jp/juggler/subwaytooter/streaming/StreamGroup.kt
index e3ebdc76..cd2f6c6e 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/streaming/StreamGroup.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/streaming/StreamGroup.kt
@@ -23,15 +23,21 @@ class StreamGroup(val spec: StreamSpec) {
 
     fun eachCallback(channelId: String?, stream: JsonArray?, item: TimelineItem?, block: (callback: StreamCallback) -> Unit) {
         // skip if channel id is provided and not match
-        if (channelId?.isNotEmpty() == true && channelId != spec.channelId) return
+        if (channelId?.isNotEmpty() == true && channelId != spec.channelId){
+            if(StreamManager.traceDelivery) log.v("${spec.name} channelId not match.")
+            return
+        }
 
-        val strStream = stream?.joinToString { "," }
+        val strStream = stream?.joinToString( "," )
 
         destinations.values.forEach { dst ->
             try {
                 if (strStream != null && item != null) {
                     val column = dst.refColumn.get() ?: return@forEach
-                    if (!dst.spec.streamFilter(column, strStream, item)) return@forEach
+                    if (!dst.spec.streamFilter(column, strStream, item)){
+                        if(StreamManager.traceDelivery) log.v("${spec.name} streamFilter not match. strStream=$strStream")
+                        return@forEach
+                    }
                 }
                 dst.refCallback.get()?.let { block(it) }
             } catch (ex: Throwable) {
diff --git a/app/src/main/java/jp/juggler/subwaytooter/streaming/StreamManager.kt b/app/src/main/java/jp/juggler/subwaytooter/streaming/StreamManager.kt
index d91a0b7b..42631b08 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/streaming/StreamManager.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/streaming/StreamManager.kt
@@ -23,6 +23,8 @@ class StreamManager(val appState: AppState) {
     companion object {
         private val log = LogCategory("StreamManager")
 
+        val traceDelivery = "false".toBoolean()
+
         // 画面ONの間は定期的に状況を更新する
         const val updateInterval = 5000L