实现单例任务，可推送新任务功能，垃圾回收功能。

InterphoneHandler.py

@@ -8,6 +8,8 @@ from machine import Pin, I2S
 import ubinascii
 import urandom
 
+import shared_vars
+
 # I2S 引脚配置
 BCLK_PIN = 13
 WS_PIN = 12
@@ -38,7 +40,6 @@ def init_i2s():
               ibuf=BUFFER_SIZE)    # 输入缓冲区大小
     return i2s
 
-
 class InterphoneHandler:
 
     def play_wav_file(self, data):
@@ -67,46 +68,46 @@ class InterphoneHandler:
             if 'audio_out' in locals():
                 audio_out.deinit()
 
-    def play_audio_stream(self, i2s, url):
+    def stream_and_play(self, data):
+        current_task_id = shared_vars.handle_task_id
+        url = "https://iot.julecn.com/interphone/get_voice?name=" + data['name']   # 替换为音频文件的URL
+        print(url)
         try:
-            # 添加请求头信息
+            print("添加请求头信息")
             headers = {
                 'User-Agent': 'MicroPython v1.0.0'
             }
-            # 发送 HTTP 请求，获取流式响应
+            print("发送 HTTP 请求，获取流式响应")
             response = urequests.get(url, headers=headers, stream=True)
 
-            # 检查响应状态码
+            print("检查响应状态码")
             if response.status_code != 200:
                 print(f"请求失败，状态码: {response.status_code}")
                 response.close()
                 return
-
-            # 解析 WAV 头部
+            print("解析 WAV 头部")
             header = response.raw.read(44)
 
             if len(header) != 44 or header[0:4] != b'RIFF' or header[8:12] != b'WAVE' or header[12:16] != b'fmt ':
                 print(header)
                 raise ValueError("Not a valid WAV file")
 
-            # 提取采样率、位深、声道数
+            print("提取采样率、位深、声道数")
             global SAMPLE_RATE, BITS_PER_SAMPLE, CHANNELS
             SAMPLE_RATE = int.from_bytes(header[24:28], 'little')
             BITS_PER_SAMPLE = int.from_bytes(header[34:36], 'little')
             CHANNELS = int.from_bytes(header[22:24], 'little')
 
-            # 重新初始化 I2S 输出
+            print("初始化 I2S 输出")
             audio_out = init_i2s()
-
-            # 开始流式播放
-            chunk_size = 1024
-
-            while True:
+            print("开始流式播放")
+            chunk_size = 512
+            while shared_vars.handle_task_id == current_task_id:
                 chunk = response.raw.read(chunk_size)
                 if not chunk:
                     break
                 audio_out.write(chunk)
-
+            
         except Exception as e:
             print("Playback error:", e)
         finally:
@@ -114,26 +115,8 @@ class InterphoneHandler:
                 audio_out.deinit()
             if 'response' in locals():
                 response.close()
-
-    def stream_and_play(self, data):
-        i2s = init_i2s()
-        url = "http://iot.julecn.com/interphone/get_voice?name=" + data['name']   # 替换为音频文件的URL
-        print(url)
-        self.play_audio_stream(i2s, url)
-
-
-def generate_random_hex():
-    # 初始化一个空的字节数组，用于存储随机字节
-    random_bytes = bytearray()
-
-    # 循环 4 次，每次生成 32 位（4 字节）的随机数
-    for _ in range(4):
-        # 生成 32 位随机数
-        rand_32_bits = urandom.getrandbits(32)
-        # 将 32 位随机数转换为 4 字节，并添加到字节数组中
-        random_bytes.extend(rand_32_bits.to_bytes(4, 'big'))
-
-    # 将随机字节转换为十六进制字符串
-    hex_string = ubinascii.hexlify(random_bytes).decode()
-    return hex_string
-
+            print('音频播放完成')
+            
+    def stop_playing(self, data):
+        print("停止播放音频")
+        pass