diff --git a/BLE-MIDI-library/build.gradle b/BLE-MIDI-library/build.gradle
index 94a0948..0698a6a 100644
--- a/BLE-MIDI-library/build.gradle
+++ b/BLE-MIDI-library/build.gradle
@@ -58,7 +58,7 @@ publishing {
         release(MavenPublication) {
             group = 'jp.kshoji'
             artifactId = 'ble-midi'
-            version = '0.0.18'
+            version = '0.0.19'
 
             afterEvaluate {
                 from components.release
diff --git a/BLE-MIDI-library/src/main/java/jp/kshoji/blemidi/central/BleMidiCallback.java b/BLE-MIDI-library/src/main/java/jp/kshoji/blemidi/central/BleMidiCallback.java
index 8ffc16e..8427bcf 100644
--- a/BLE-MIDI-library/src/main/java/jp/kshoji/blemidi/central/BleMidiCallback.java
+++ b/BLE-MIDI-library/src/main/java/jp/kshoji/blemidi/central/BleMidiCallback.java
@@ -141,9 +141,6 @@ public void onServicesDiscovered(final BluetoothGatt gatt, int status) {
                     public void run() {
                         // this calls onCharacteristicRead after completed
                         gatt.readCharacteristic(manufacturerCharacteristic);
-                        if (gattRequestQueue.size() > 0) {
-                            gattRequestQueue.remove(0).run();
-                        }
                     }
                 });
             }
@@ -155,9 +152,6 @@ public void run() {
                     public void run() {
                         // this calls onCharacteristicRead after completed
                         gatt.readCharacteristic(modelCharacteristic);
-                        if (gattRequestQueue.size() > 0) {
-                            gattRequestQueue.remove(0).run();
-                        }
                     }
                 });
             }
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19-sources.jar b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19-sources.jar
new file mode 100644
index 0000000..f4ccb27
Binary files /dev/null and b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19-sources.jar differ
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19-sources.jar.md5 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19-sources.jar.md5
new file mode 100644
index 0000000..db4c445
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19-sources.jar.md5
@@ -0,0 +1 @@
+076c69913cbb46c2095fe4b72b102b57
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19-sources.jar.sha1 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19-sources.jar.sha1
new file mode 100644
index 0000000..7c4999d
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19-sources.jar.sha1
@@ -0,0 +1 @@
+101ead1f176675b92b4896aa31cfbac75420766b
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19-sources.jar.sha256 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19-sources.jar.sha256
new file mode 100644
index 0000000..545c042
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19-sources.jar.sha256
@@ -0,0 +1 @@
+d587ee96484eb83bf2aafa0087b8b7754d0ca64f21e6c8e0183841c77c0bcde3
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19-sources.jar.sha512 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19-sources.jar.sha512
new file mode 100644
index 0000000..61845cc
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19-sources.jar.sha512
@@ -0,0 +1 @@
+33ee3ce71499fddf1f9ed20401459378eb86be8256a96b93472937039f350f41e5722db27bb879d6cdfdb338c01d72c1b8dcbef7ce3d1ee6e015d8017fbeebca
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.aar b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.aar
new file mode 100644
index 0000000..27fef4d
Binary files /dev/null and b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.aar differ
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.aar.md5 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.aar.md5
new file mode 100644
index 0000000..3c1bb0b
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.aar.md5
@@ -0,0 +1 @@
+5f430040ca8d369b5258ecb101c8e023
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.aar.sha1 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.aar.sha1
new file mode 100644
index 0000000..6725ac1
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.aar.sha1
@@ -0,0 +1 @@
+df0436aa2fdbc9263b9b1b22c045bc2c105f7b1d
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.aar.sha256 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.aar.sha256
new file mode 100644
index 0000000..934a537
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.aar.sha256
@@ -0,0 +1 @@
+fd394566dd8079aca03ad6ca113d229c76c58291128be9a40176114f4db884ac
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.aar.sha512 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.aar.sha512
new file mode 100644
index 0000000..724bea6
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.aar.sha512
@@ -0,0 +1 @@
+a784add7eb5e7dc0c6051ab1de5cc2ee1cc08945f7a0c0900f1d0f14ee1040df30a31ccd99ccc2e640833484799595d94c7cf1798e57824eca6821358d8ed1b8
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.module b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.module
new file mode 100644
index 0000000..740b412
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.module
@@ -0,0 +1,136 @@
+{
+  "formatVersion": "1.1",
+  "component": {
+    "group": "jp.kshoji",
+    "module": "ble-midi",
+    "version": "0.0.19",
+    "attributes": {
+      "org.gradle.status": "release"
+    }
+  },
+  "createdBy": {
+    "gradle": {
+      "version": "8.6"
+    }
+  },
+  "variants": [
+    {
+      "name": "releaseVariantReleaseApiPublication",
+      "attributes": {
+        "org.gradle.category": "library",
+        "org.gradle.dependency.bundling": "external",
+        "org.gradle.libraryelements": "aar",
+        "org.gradle.usage": "java-api"
+      },
+      "dependencies": [
+        {
+          "group": "jp.kshoji",
+          "module": "javax-sound-midi",
+          "version": {
+            "requires": "0.0.6"
+          },
+          "excludes": [
+            {
+              "group": "*",
+              "module": "*"
+            }
+          ],
+          "thirdPartyCompatibility": {
+            "artifactSelector": {
+              "name": "javax-sound-midi",
+              "type": "aar",
+              "extension": "aar"
+            }
+          }
+        },
+        {
+          "group": "com.android.support",
+          "module": "support-annotations",
+          "version": {
+            "requires": "28.0.0"
+          }
+        }
+      ],
+      "files": [
+        {
+          "name": "ble-midi-0.0.19.aar",
+          "url": "ble-midi-0.0.19.aar",
+          "size": 103142,
+          "sha512": "a784add7eb5e7dc0c6051ab1de5cc2ee1cc08945f7a0c0900f1d0f14ee1040df30a31ccd99ccc2e640833484799595d94c7cf1798e57824eca6821358d8ed1b8",
+          "sha256": "fd394566dd8079aca03ad6ca113d229c76c58291128be9a40176114f4db884ac",
+          "sha1": "df0436aa2fdbc9263b9b1b22c045bc2c105f7b1d",
+          "md5": "5f430040ca8d369b5258ecb101c8e023"
+        }
+      ]
+    },
+    {
+      "name": "releaseVariantReleaseRuntimePublication",
+      "attributes": {
+        "org.gradle.category": "library",
+        "org.gradle.dependency.bundling": "external",
+        "org.gradle.libraryelements": "aar",
+        "org.gradle.usage": "java-runtime"
+      },
+      "dependencies": [
+        {
+          "group": "jp.kshoji",
+          "module": "javax-sound-midi",
+          "version": {
+            "requires": "0.0.6"
+          },
+          "excludes": [
+            {
+              "group": "*",
+              "module": "*"
+            }
+          ],
+          "thirdPartyCompatibility": {
+            "artifactSelector": {
+              "name": "javax-sound-midi",
+              "type": "aar",
+              "extension": "aar"
+            }
+          }
+        },
+        {
+          "group": "com.android.support",
+          "module": "support-annotations",
+          "version": {
+            "requires": "28.0.0"
+          }
+        }
+      ],
+      "files": [
+        {
+          "name": "ble-midi-0.0.19.aar",
+          "url": "ble-midi-0.0.19.aar",
+          "size": 103142,
+          "sha512": "a784add7eb5e7dc0c6051ab1de5cc2ee1cc08945f7a0c0900f1d0f14ee1040df30a31ccd99ccc2e640833484799595d94c7cf1798e57824eca6821358d8ed1b8",
+          "sha256": "fd394566dd8079aca03ad6ca113d229c76c58291128be9a40176114f4db884ac",
+          "sha1": "df0436aa2fdbc9263b9b1b22c045bc2c105f7b1d",
+          "md5": "5f430040ca8d369b5258ecb101c8e023"
+        }
+      ]
+    },
+    {
+      "name": "releaseVariantReleaseSourcePublication",
+      "attributes": {
+        "org.gradle.category": "documentation",
+        "org.gradle.dependency.bundling": "external",
+        "org.gradle.docstype": "sources",
+        "org.gradle.usage": "java-runtime"
+      },
+      "files": [
+        {
+          "name": "ble-midi-0.0.19-sources.jar",
+          "url": "ble-midi-0.0.19-sources.jar",
+          "size": 46563,
+          "sha512": "33ee3ce71499fddf1f9ed20401459378eb86be8256a96b93472937039f350f41e5722db27bb879d6cdfdb338c01d72c1b8dcbef7ce3d1ee6e015d8017fbeebca",
+          "sha256": "d587ee96484eb83bf2aafa0087b8b7754d0ca64f21e6c8e0183841c77c0bcde3",
+          "sha1": "101ead1f176675b92b4896aa31cfbac75420766b",
+          "md5": "076c69913cbb46c2095fe4b72b102b57"
+        }
+      ]
+    }
+  ]
+}
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.module.md5 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.module.md5
new file mode 100644
index 0000000..f094dca
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.module.md5
@@ -0,0 +1 @@
+03f619ee6599139b789d61bd1382f516
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.module.sha1 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.module.sha1
new file mode 100644
index 0000000..cec435c
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.module.sha1
@@ -0,0 +1 @@
+754dbd14346302f7885fe8c7b8fb73c041e190ed
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.module.sha256 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.module.sha256
new file mode 100644
index 0000000..a8e679a
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.module.sha256
@@ -0,0 +1 @@
+73a44922a4aff49f10950564d8d3e2624b265194995f98fc43f05ad1669a35ce
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.module.sha512 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.module.sha512
new file mode 100644
index 0000000..8ec87d6
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.module.sha512
@@ -0,0 +1 @@
+6233c074e7b239ced38af39eae6708a0b2e20e8db57ba1e921183cd01c13c71e21599ee7991606814e2eead1aa983e9075725c3b9d5b3482bc442741c128a6d6
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.pom b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.pom
new file mode 100644
index 0000000..0db3ac0
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.pom
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+  <!-- This module was also published with a richer model, Gradle metadata,  -->
+  <!-- which should be used instead. Do not delete the following line which  -->
+  <!-- is to indicate to Gradle or any Gradle module metadata file consumer  -->
+  <!-- that they should prefer consuming it instead. -->
+  <!-- do_not_remove: published-with-gradle-metadata -->
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>jp.kshoji</groupId>
+  <artifactId>ble-midi</artifactId>
+  <version>0.0.19</version>
+  <packaging>aar</packaging>
+  <dependencies>
+    <dependency>
+      <groupId>jp.kshoji</groupId>
+      <artifactId>javax-sound-midi</artifactId>
+      <version>0.0.6</version>
+      <type>aar</type>
+      <classifier></classifier>
+      <scope>compile</scope>
+      <exclusions>
+        <exclusion>
+          <groupId>*</groupId>
+          <artifactId>*</artifactId>
+        </exclusion>
+      </exclusions>
+    </dependency>
+    <dependency>
+      <groupId>com.android.support</groupId>
+      <artifactId>support-annotations</artifactId>
+      <version>28.0.0</version>
+      <scope>compile</scope>
+    </dependency>
+  </dependencies>
+</project>
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.pom.md5 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.pom.md5
new file mode 100644
index 0000000..cf9b32d
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.pom.md5
@@ -0,0 +1 @@
+e3dc8f0556a42e15a2573d5b10279b5e
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.pom.sha1 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.pom.sha1
new file mode 100644
index 0000000..4ff713d
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.pom.sha1
@@ -0,0 +1 @@
+637a154905eb3aa8dd90adff7f6703bbe13d73ad
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.pom.sha256 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.pom.sha256
new file mode 100644
index 0000000..f8166bf
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.pom.sha256
@@ -0,0 +1 @@
+17a9e0088d3d477b3e3d07d959ba82e2886d35b1677eb5c23ab8e00a8d548a1a
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.pom.sha512 b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.pom.sha512
new file mode 100644
index 0000000..1b20366
--- /dev/null
+++ b/library/repository/jp/kshoji/ble-midi/0.0.19/ble-midi-0.0.19.pom.sha512
@@ -0,0 +1 @@
+f06222ab1d876a5c6db5096cda829aff992d5514efe1c22aa897a8f252213036568be165958410b9fd81d361a0e3b986ee31f4d7a8eab6eadb2706a0569720ef
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/maven-metadata.xml b/library/repository/jp/kshoji/ble-midi/maven-metadata.xml
index b7c3182..d8568a3 100644
--- a/library/repository/jp/kshoji/ble-midi/maven-metadata.xml
+++ b/library/repository/jp/kshoji/ble-midi/maven-metadata.xml
@@ -3,8 +3,8 @@
   <groupId>jp.kshoji</groupId>
   <artifactId>ble-midi</artifactId>
   <versioning>
-    <latest>0.0.18</latest>
-    <release>0.0.18</release>
+    <latest>0.0.19</latest>
+    <release>0.0.19</release>
     <versions>
       <version>0.0.1</version>
       <version>0.0.2</version>
@@ -24,7 +24,8 @@
       <version>0.0.16</version>
       <version>0.0.17</version>
       <version>0.0.18</version>
+      <version>0.0.19</version>
     </versions>
-    <lastUpdated>20240506055353</lastUpdated>
+    <lastUpdated>20240522012628</lastUpdated>
   </versioning>
 </metadata>
diff --git a/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.md5 b/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.md5
index 435762f..4d05360 100644
--- a/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.md5
+++ b/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.md5
@@ -1 +1 @@
-22748b2f49d9040336909167332b0c31
\ No newline at end of file
+072d52c816d28ebf0a5fe4c512564071
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.sha1 b/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.sha1
index b13ad70..e8bc5cc 100644
--- a/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.sha1
+++ b/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.sha1
@@ -1 +1 @@
-206e751023b69dea2b0e986a68d9463d079a4741
\ No newline at end of file
+588ae8dec65f3b1d0f13069f9e213976891ab371
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.sha256 b/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.sha256
index b263060..98983e8 100644
--- a/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.sha256
+++ b/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.sha256
@@ -1 +1 @@
-8d45650061a0a1994d8451d9f23e1903fa33e2c52d9ce6c6a00eeea3d5135c6a
\ No newline at end of file
+1e58005e543acd349049832fdd8b2dc648f8689b59351e9cfb3ad8f613d0af74
\ No newline at end of file
diff --git a/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.sha512 b/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.sha512
index 1bacc08..53b2d18 100644
--- a/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.sha512
+++ b/library/repository/jp/kshoji/ble-midi/maven-metadata.xml.sha512
@@ -1 +1 @@
-0ba0ad5c68184cfb0b035e4b39132c181c97c3700b4af2360363f6930ecbb055b1a21d622fb5313277b7e7379418954e336aa662618588e92fa336025538acd0
\ No newline at end of file
+66ccb3f0663d7ba9be1dbe45e67e02e2b8821751bb76d11bc5c410cf9f9d3be1e1d15fd13ddfd6cce568613341161959347c3f0ed674cc11889c80b459439fdd
\ No newline at end of file