Fix bizzare NPE in context generation for DeviceClient.

Add test for remote client

controls-magix/build.gradle.kts

@@ -12,6 +12,7 @@ description = """
 kscience {
     jvm()
     js()
+    useCoroutines("1.8.0")
     useSerialization {
         json()
     }

controls-magix/src/commonMain/kotlin/space/kscience/controls/client/DeviceClient.kt

@@ -1,8 +1,8 @@
 package space.kscience.controls.client
 
 import com.benasher44.uuid.uuid4
+import kotlinx.coroutines.Job
 import kotlinx.coroutines.flow.*
-import kotlinx.coroutines.newCoroutineContext
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
 import space.kscience.controls.api.*
@@ -28,8 +28,8 @@ public class DeviceClient(
     private val send: suspend (DeviceMessage) -> Unit,
 ) : CachingDevice {
 
-    @OptIn(kotlinx.coroutines.ExperimentalCoroutinesApi::class)
+
-    override val coroutineContext: CoroutineContext = newCoroutineContext(context.coroutineContext)
+    override val coroutineContext: CoroutineContext = context.coroutineContext + Job(context.coroutineContext[Job])
 
     private val mutex = Mutex()
 

controls-magix/src/commonTest/kotlin/space/kscience/controls/client/RemoteDeviceConnect.kt

@@ -0,0 +1,87 @@
+package space.kscience.controls.client
+
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.test.runTest
+import kotlinx.serialization.json.Json
+import space.kscience.controls.api.Device
+import space.kscience.controls.manager.DeviceManager
+import space.kscience.controls.manager.install
+import space.kscience.controls.manager.respondMessage
+import space.kscience.controls.spec.*
+import space.kscience.dataforge.context.Context
+import space.kscience.dataforge.context.Factory
+import space.kscience.dataforge.context.request
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.get
+import space.kscience.dataforge.meta.int
+import space.kscience.dataforge.names.Name
+import space.kscience.magix.api.MagixEndpoint
+import space.kscience.magix.api.MagixMessage
+import space.kscience.magix.api.MagixMessageFilter
+import kotlin.random.Random
+import kotlin.test.Test
+import kotlin.test.assertContains
+import kotlin.time.Duration.Companion.milliseconds
+
+
+public suspend fun <T> Device.readUnsafe(propertySpec: DevicePropertySpec<*, T>): T =
+    propertySpec.converter.metaToObject(readProperty(propertySpec.name)) ?: error("Property read result is not valid")
+
+internal class RemoteDeviceConnect {
+
+    class TestDevice(context: Context, meta: Meta) : DeviceBySpec<TestDevice>(TestDevice, context, meta) {
+        private val rng = Random(meta["seed"].int ?: 0)
+
+        private val randomValue get() = rng.nextDouble()
+
+        companion object : DeviceSpec<TestDevice>(), Factory<TestDevice> {
+
+            override fun build(context: Context, meta: Meta): TestDevice = TestDevice(context, meta)
+
+            val value by doubleProperty { randomValue }
+
+            override suspend fun TestDevice.onOpen() {
+                doRecurring((meta["delay"].int ?: 10).milliseconds) {
+                    read(value)
+                }
+            }
+        }
+    }
+
+    @Test
+    fun wrapper() = runTest {
+        val context = Context {
+            plugin(DeviceManager)
+        }
+
+        val device = context.request(DeviceManager).install("test", TestDevice)
+
+        val virtualMagixEndpoint = object : MagixEndpoint {
+
+
+            override fun subscribe(filter: MagixMessageFilter): Flow<MagixMessage> = device.messageFlow.map {
+                MagixMessage(
+                    format = DeviceManager.magixFormat.defaultFormat,
+                    payload = MagixEndpoint.magixJson.encodeToJsonElement(DeviceManager.magixFormat.serializer, it),
+                    sourceEndpoint = "test",
+                )
+            }
+
+            override suspend fun broadcast(message: MagixMessage) {
+                device.respondMessage(
+                    Name.EMPTY,
+                    Json.decodeFromJsonElement(DeviceManager.magixFormat.serializer, message.payload)
+                )
+            }
+
+            override fun close() {
+                //
+            }
+        }
+
+        val remoteDevice = virtualMagixEndpoint.remoteDevice(context, "test", Name.EMPTY)
+
+        assertContains(0.0..1.0, remoteDevice.readUnsafe(TestDevice.value))
+    }
+}