1.下发AT+BLDNd到 hci0,标准API如下
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/**
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* Send AT command message.
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*
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* @param fd Opened socket file descriptor.
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like this:
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const char *ba_interface = "hci0"; developer should use bluealsa_open to get the fd
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ba_fd = bluealsa_open(ba_interface));
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* @param bdaddr_t addr MAC address of the Bluetooth device,
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MAC addr like this:D8:1D:72:1C:26:DC
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* @param command NULL-terminated command string
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AT command such as:
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"ATA,AT+CHUP/ATD/AT+BLDN"
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* @return Upon success this function returns 0. Otherwise, -1 is returned. */
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int bluealsa_send_rfcomm_command(int fd, bdaddr_t addr, const char *command)
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2. 应用包含ctl-client.h bluetooth.h ctl-proto.h 避免有些结构体找不到，这些文件是从BLUEZ和blualsa截取出来，直接使用
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