在调用discoverServices后，iOS BLE外围设备会立即断开连接 [英] iOS BLE peripherals keep disconnecting immediately after discoverServices is called
问题描述
在为iOS开发BLE应用程序时，我会在调用discoverServices后立即断开连接。我正在使用4个精确的BLE设备（OEM）进行测试，并且我在完全相同的两个设备上继续进行断开连接。每次。我知道设备还可以，因为我也在Android上构建了相同的应用程序，并且使用相同的设备，所有4个都保持连接状态。这是使用Titanium，但这里的所有内容都是在iOS中实现的。以下是相关的iOS代码：
While developing a BLE app for iOS, I keep getting a disconnect immediately after discoverServices is called. I am testing with 4 exact BLE devices (OEM), and I keep getting this disconnect on exactly the same two devices. Every time. I know the devices are ok, because I've also built the same app on Android, and with the same devices, all 4 stay connected. This is using Titanium, but everything here is implemented in iOS. Here's the relevant iOS code:
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
TiLogMessage(@"[INFO] ===== %@ - centralManagerDidUpdateState: entry",self);
NSString *state = nil;
switch (central.state) {
case CBCentralManagerStatePoweredOn:
state = @"CentralManagerStatePoweredOn";
break;
case CBCentralManagerStateUnknown:
state = @"CentralManagerStateUnknown";
break;
case CBCentralManagerStateResetting:
state = @"CentralManagerStateResetting";
break;
case CBCentralManagerStateUnsupported:
state = @"CentralManagerStateUnsupported";
break;
case CBCentralManagerStateUnauthorized:
state = @"CentralManagerStateUnauthorized";
break;
case CBCentralManagerStatePoweredOff:
state = @"CentralManagerStatePoweredOff";
break;
default:
TiLogMessage(@"[INFO] ===== %@ - centralManagerDidUpdateState default -> break",self);
break;
}
TiLogMessage(@"[INFO] ===== %@ - centralManagerDidUpdateState state changed to: %@",self, state);
NSDictionary *event = [NSDictionary dictionaryWithObjectsAndKeys:state, @"state", nil];
if ([self _hasListeners:@"centralManagerStateChange"]) {
[self fireEvent:@"centralManagerStateChange" withObject: event];
}
TiLogMessage(@"[INFO] ===== %@ - centralManagerDidUpdateState: exit",self);
}
- (void) connectPeripheral:(id)args
{
TiLogMessage(@"[INFO] ===== %@ : connectPeripheral - entry",self);
NSString* uuid = [[[args objectAtIndex:0] objectForKey:@"peripheral"] objectForKey: @"UUID"];
for (CBPeripheral *peripheral in self.discoveredPeripherals){
if ([[peripheral.identifier UUIDString] isEqualToString:uuid]){
TiLogMessage(@"[INFO] ===== %@ : connectPeripheral - device is %@",self, peripheral);
TiLogMessage(@"[INFO] ===== %@ : connectPeripheral - attempting to connect to %@",self, peripheral.name);
if (self.connectedPeripherals){
TiLogMessage(@"[INFO] ===== %@ : connectedPeripheral - connectedPeripherals is ok...",self);
if (![self.connectedPeripherals containsObject:peripheral]){
TiLogMessage(@"[INFO] ===== %@ : connectPeripheral - device is not connected. Connecting.",self);
if (centralManager.state == CBCentralManagerStatePoweredOn){
[centralManager connectPeripheral:peripheral options:nil];
}
}
else{
TiLogMessage(@"[INFO] ===== %@ : connectPeripheral - device is already connected. %@",self,peripheral);
}
}
}
}
TiLogMessage(@"[INFO] ===== %@ : connectPeripheral - exit",self);
}
- (void) centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
TiLogMessage(@"[INFO] ===== %@ : didConnectPeripheral - entry",self);
if ( [manuallyDisconnectedPeripherals containsObject:[peripheral.identifier UUIDString]] ){
[manuallyDisconnectedPeripherals removeObject:[peripheral.identifier UUIDString]];
}
if (![self.connectedPeripherals containsObject:peripheral]){
[peripheral setDelegate:self];
[self.connectedPeripherals addObject: peripheral];
NSNumber *RSSI = 0;
if (peripheral.RSSI != nil){
RSSI = peripheral.RSSI;
}
NSDictionary *peripheralObj = [NSDictionary dictionaryWithObjectsAndKeys: [peripheral.identifier UUIDString], @"UUID",
peripheral.name, @"name",[NSNumber numberWithInteger:1], @"isConnected", RSSI, @"RSSI", nil];
NSDictionary *event = [NSDictionary dictionaryWithObjectsAndKeys: peripheralObj, @"peripheral",
[peripheral.identifier UUIDString], @"UUID",nil];
if ([self _hasListeners:@"didConnectPeripheral"]) {
[self fireEvent:@"didConnectPeripheral" withObject: event];
}
}
TiLogMessage(@"[INFO] ===== %@ : didConnectPeripheral - exit",self);
}
- (void) discoverServices:(id)args
{
TiLogMessage(@"[INFO] ===== %@ : discoverServices - entry",self);
ENSURE_SINGLE_ARG(args,NSDictionary);
NSString *peripheralUUID = [[args objectForKey:@"peripheral"] objectForKey:@"UUID"];
TiLogMessage(@"[INFO] ===== %@ : discoverServices - for %@",self,peripheralUUID);
if (self.connectedPeripherals){
for (CBPeripheral *peripheral in self.connectedPeripherals){
if ([[peripheral.identifier UUIDString] isEqualToString:peripheralUUID]){
TiLogMessage(@"[INFO] ===== %@ : discoverServices - , attempting to discover services for %@",self,peripheral);
[peripheral discoverServices: [BLEServicesCBUUIDs count] > 0 ? BLEServicesCBUUIDs : nil];
}
}
}
TiLogMessage(@"[INFO] ===== %@ : discoverServices - exit",self);
}
推荐答案
您需要强烈保留CBPeripheral实例（您正在使用它）。
例如，在视图控制器中，您需要拥有一个属性
You need to keep CBPeripheral instance (by which you are working) strongly. For example in your view controller you need to have a property
@property（强，非原子）CBPeripheral * activePeripheral;
@property (strong, nonatomic) CBPeripheral *activePeripheral;
将找到的外围设备分配给activePeripheral，之后你的员工（连接/发现/等等......）
Assign found peripheral to activePeripheral, after which do your staff (connecting/discovering/etc...)
我认为使用像CoreBluetooth这样的框架并不是获得良好结果的好方法，你需要一些高级的，基于块的。这是我刚刚为您提交的图书馆
https://github.com/DavidSahakyan/LGBluetooth
I think using Framework like a CoreBluetooth is not a good way to achieve good results, you need something high level, block based. Here is a library that I have just commited for you https://github.com/DavidSahakyan/LGBluetooth
这将使蓝牙生活变得更加轻松。
It will make life with bluetooth much more easier.
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