fix: FarStay 2B→1B 匹配设备实际固件

协议: 0x4B LEN=0x16, 0x4C LEN=0x1A
代码: build_4b FarStay 1B, parse_4c FarStay payload[24]
前端: FarStay max=255

edc-web/app/routes/fixture.py

@@ -65,12 +65,12 @@ def build_4b_packet(addr: int, dev_type: int, test_mode: int,
                     near_stay: int = 0, far_stay: int = 0) -> str:
     """构造 0x4B 配置指令 hex 字符串 (V2.0.3 扩展)
 
-    格式: 7F | 81 | 17 | 4B | Addr(1) | DevType(1) | TestMode(1) |
+    格式: 7F | 81 | 16 | 4B | Addr(1) | DevType(1) | TestMode(1) |
           ResetDis(1) | MinusDis(1) |
           SensMin(2 LE) | SensMax(2 LE) | FreMin(2 LE) | FreMax(2 LE) |
           PeakMin(2 LE) | PeakMax(2 LE) |
           FarTol(1) | NearTol(1) | StepTol(1) | BackForth(1) |
-          NearStay(2 LE) | FarStay(2 LE) | XOR | SUM
+          NearStay(2 LE) | FarStay(1) | XOR | SUM
     """
     payload = bytes([
         0x4B,           # CMD
@@ -90,7 +90,8 @@ def build_4b_packet(addr: int, dev_type: int, test_mode: int,
         step_tol & 0xFF,
         back_forth & 0xFF,
     ])
-    payload += _le16(near_stay) + _le16(far_stay)
+    payload += _le16(near_stay)
+    payload += bytes([far_stay & 0xFF])  # FarStay 1 字节
 
     pkt = bytes([0x7F, 0x81, len(payload)]) + payload
     xor, total = _xor_sum(pkt[1:])

edc-web/app/templates/fixture.html

@@ -92,7 +92,7 @@
                 </div>
                 <div class="form-group">
                     <label>最远停留时间 (ms)</label>
-                    <input type="number" id="param-far-stay" value="0" min="0" max="65535">
+                    <input type="number" id="param-far-stay" value="0" min="0" max="255">
                 </div>
             </div>