fix: 4g通讯

at_client.py

@@ -76,10 +76,11 @@ class ATClient:
         """
         expect_b = expect.encode() if isinstance(expect, str) else expect
         with self._cmd_lock:
-            # 初始化等待
-            self._waiting = True
-            self._expect = expect_b
-            self._resp = b""
+            with self._q_lock:
+                # 初始化等待
+                self._waiting = True
+                self._expect = expect_b
+                self._resp = b""
 
             # 发送
             if cmd:
@@ -300,8 +301,8 @@ class ATClient:
                     if len(self._rx) > 512 * 1024:
                         self._rx = self._rx[-256 * 1024:]
                 else:
-                    if len(self._rx) > 16384:
-                        self._rx = self._rx[-4096:]
+                    if len(self._rx) > 32768:
+                        self._rx = self._rx[-16384:]