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关于zigbee的终端节点更换信道问题,协议栈H1.2。

Other Parts Discussed in Thread: CC2530
芯片:CC2530
协议栈:zigbee1.2.2a
硬件环境:1个协调器,15个路由器节点,20多个电池终端节点。
软件其它:
1,ZIGBEEPRO
2,协调器使能多对一  ,即 #define CONCENTRATOR_ENABLE          true
3,f8wConfig.cfg文件中    -DZDNWKMGR_MIN_TRANSMISSIONS=0
/* Minimum transmissions attempted for Channel Interference detection,
 * Frequency Agility can be disabled by setting this parameter to zero.
 */
问题:
1,之前,工程中设备 -DZDNWKMGR_MIN_TRANSMISSIONS=20  (栈默认的)发现,总有少部分电池终端更换信道,或更换PANID。是通过抓包软件发现的。
2,现在根据swra427c文档提示,-DZDNWKMGR_MIN_TRANSMISSIONS=0,可以“Turns off frequency agility”,上周五我们么搭建了一个环境,所有节点的宏设置改为-DZDNWKMGR_MIN_TRANSMISSIONS=0,节点数量如上说明,周五时测试时,信道为25信道,但是今天周一来到公司,发现有几个电池终端节点更换的信道到26,为何?
期盼高手解答以下,谢谢!