问题描述
我使用的是来自 this page 的 Android 示例代码。
刚刚将第 29 行的 connstring@H_404_4@ 的内容替换为 client.open();
我正在使用 SAS 身份验证。
第一个错误是尝试调用 Connected to process 20170 on device '7.3_Foldable_API_30 [emulator-5554]'.
Capturing and displaying logcat messages from application. This behavior can be disabled in the "Logcat output" section of the "Debugger" settings page.
D/NetworkSecurityConfig: No Network Security Config specified,using platform default
No Network Security Config specified,using platform default
I/MultiDex: VM with version 2.1.0 has multidex support
Installing application
VM has multidex support,MultiDex support library is disabled.
D/libEGL: loaded /vendor/lib/egl/libEGL_emulation.so
D/libEGL: loaded /vendor/lib/egl/libGLESv1_CM_emulation.so
D/libEGL: loaded /vendor/lib/egl/libGLESv2_emulation.so
I/TetheringManager: registerTetheringEventCallback:com.example.kttracking
W/System.err: SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (nop) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
D/HostConnection: HostConnection::get() New Host Connection established 0xf03da8e0,tid 20194
D/HostConnection: HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_native_sync_v4 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_YUV_Cache ANDROID_EMU_async_unmap_buffer GL_OES_EGL_image_external_essl3 GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_host_side_tracing ANDROID_EMU_async_frame_commands ANDROID_EMU_gles_max_version_3_0
W/System.err: Exception while opening IoTHub connection: java.io.IOException: Could not open the connection
I/System.out: Shutting down...
I/System.out: Message Sent: "temperature":22.84,"humidity":48.31
W/System.err: Exception while sending event: java.lang.IllegalStateException: Cannot send event from an IoT Hub client that is closed.
W/Openglrenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED,retrying without...
D/EGL_emulation: eglCreateContext: 0xf03f3ee0: maj 3 min 0 rcv 3
D/EGL_emulation: eglMakeCurrent: 0xf03f3ee0: ver 3 0 (tinfo 0xf0738cf0) (first time)
I/Gralloc4: mapper 4.x is not supported
D/HostConnection: createUnique: call
HostConnection::get() New Host Connection established 0xf03f3af0,tid 20194
D/goldfish-address-space: allocate: Ask for block of size 0x100
allocate: ioctl allocate returned offset 0x3fc01c000 size 0x2000
D/HostConnection: HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_native_sync_v4 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_YUV_Cache ANDROID_EMU_async_unmap_buffer GL_OES_EGL_image_external_essl3 GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_host_side_tracing ANDROID_EMU_async_frame_commands ANDROID_EMU_gles_max_version_3_0
I/System.out: Message Sent: "temperature":20.74,"humidity":31.12
W/System.err: Exception while sending event: java.lang.IllegalStateException: Cannot send event from an IoT Hub client that is closed.
I/System.out: Message Sent: "temperature":26.08,"humidity":43.27
W/System.err: Exception while sending event: java.lang.IllegalStateException: Cannot send event from an IoT Hub client that is closed.
（第 138 行）。
每次尝试发送消息时都会出现以下错误（第 122 行）。
├── calculator
│ ├── __init__.py
│ ├── addTwo.py
│ ├── mulTwo.py
│ └── sum.py
└── main.py
解决方法
您使用的是什么协议？那是MQTT吗？另请检查您使用的设备客户端版本。
您可以做的第二件事是尝试在不同的设备上，看看问题是否仍然存在。有时某些设备确实会出现这样的问题。
,最后我尝试了这个 https://www.mathworks.com/help/stats/classificationecoc.predict.html#bufel6_-NegLoss。它有效。