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      <description>待填：两句话——什么问题、什么根因。</description>
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      <title>4G 弱网恢复机制的四次演进</title>
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      <description>地下车库、厂区边角的 4G 弱网场景下，恢复机制从固定重试改到阶梯退避、再到分级恢复矩阵，中间踩过自己埋的定时重启 bug，最终收敛到指数退避加随机抖动。</description>
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      <title>CANopen 从站批量掉线：追到 CAN 驱动中断的一次排查</title>
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