*

ble-protocol/build.gradle.kts

@@ -5,7 +5,15 @@ plugins {
 }
 
 kotlin {
-    jvmToolchain(17)
+    // 本机无 JDK 17 工具链，用当前 JVM（21）编译，统一输出 Java 17 字节码
+    compilerOptions {
+        jvmTarget.set(org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17)
+    }
+}
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_17
+    targetCompatibility = JavaVersion.VERSION_17
 }
 
 dependencies {