1:用藍(lán)牙工具測(cè)試是否是硬件問(wèn)題，我用lightBlue測(cè)試硬件是沒(méi)問(wèn)題的
2:那就是我的問(wèn)題了，最后解決如下：需再外部斷開(kāi)的回調(diào)中，重新初始化藍(lán)牙設(shè)備管理對(duì)象，重新啟動(dòng)搜索就可以搜索到該設(shè)備了

//Peripherals斷開(kāi)連接
- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error{
    NSLog(@">>>外設(shè)連接斷開(kāi)連接 %@: %@___需要連接的設(shè)備:%@__來(lái)自外部斷開(kāi):%d", [peripheral name], [error localizedDescription],[self.needReConnectPeripheral name],isFromReconnect);
    //清除當(dāng)前連接
    [self removeDisconnectPeripheral:peripheral];
    
    if(isFromReconnect){//來(lái)自重連前的斷開(kāi)
        isFromReconnect = NO;
        if(self.needReConnectPeripheral){
            self.peripheral = self.needReConnectPeripheral;
            [manager connectPeripheral:self.peripheral options:nil];
        }
    }else{//來(lái)自外部斷開(kāi)
        //清除所有重新開(kāi)始
        [self.peripheralArray removeAllObjects];
        //初始化并設(shè)置委托和線(xiàn)程隊(duì)列，最好一個(gè)線(xiàn)程的參數(shù)可以為nil，默認(rèn)會(huì)就main線(xiàn)程
        manager = [[CBCentralManager alloc] initWithDelegate:self queue:dispatch_get_main_queue()];
        [manager scanForPeripheralsWithServices:nil options:0];
    }

}