Constant CMD_TRADE_CIPHER_EXCHANGE
pub const CMD_TRADE_CIPHER_EXCHANGE: u16 = 2902; // 2_902u16Expand description
断线重连及已解锁会话定时续期使用的交易 cipher 交换命令。
Ref: NNBase_Define_ProtoCmd.h:31 /
NNProto_Trd_UnlockTrd.cpp:129-171,310-360.