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hi，
请问这里为什么需要向ICALL注册APP才能发送和接收messages?
谢谢！
您好，
如下方链接中 "Creating Additional ICall Enabled Tasks"部分所述，仅当您想使用 BLE 堆栈发送/接收消息时才需要注册 ICall。如果您不调用任何 Stack API，则无需向 ICall 注册您的任务：
https://dev.ti.com/tirex/explore/content/simplelink_lowpower_f3_sdk_7_40_00_64/docs/ble5stack/ble_user_guide/html/ble-stack-5.x/the-application-cc23xx.html#icall-initialization-and-registration
另外，如果是在自己创建的任务里面调用函数，也需要先注册 iCall 。
