手机无法用BlunoBasicDemo 搜索到RoMeo BLE
求各位大神！如何用手机连接上RoMeo BLE v1.0或Beetle BLE板子？我按照资料库里的提示，板子下载了代码：
void setup() {
Serial.begin(115200); //initial the Serial
}
void loop(){
if(Serial.available())
{
Serial.write(Serial.read()); //send what has been received
Serial.println(); //print line feed character
}
}
接着把固件升级到了Bluno_V1.97。
然后手机安装了BlunoBasicDemo 软件。
但是APP就是没有SCAN到板子，点击Scan什么都没有。
请教各位大神，有哪位大神能帮忙指点一下。或者其他办法能让手机通过蓝牙连接到板子。（我的手机是华为p20）
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