[英]iOS BLE peripherals keep disconnecting immediately after discoverServices is called
While developing a BLE app for iOS, I keep getting a disconnect immediately after discoverServices is called. 在开发适用于iOS的BLE应用程序时,在调用discoverServices之后,我会立即断开连接。 I am testing with 4 exact BLE devices (OEM), and I keep getting this disconnect on exactly the same two devices.
我正在使用4个完全一样的BLE设备(OEM)进行测试,并且在完全相同的两个设备上不断断开连接。 Every time.
每次。 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.
我知道设备还可以,因为我还在Android上构建了相同的应用程序,并且使用相同的设备,所有4个设备始终保持连接。 This is using Titanium, but everything here is implemented in iOS.
这使用的是Titanium,但是这里的所有内容都在iOS中实现。 Here's the relevant iOS code:
以下是相关的iOS代码:
- (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);
} }
You need to keep CBPeripheral instance (by which you are working) strongly. 您需要严格保持CBPeripheral实例(您正在使用的实例)。 For example in your view controller you need to have a property
例如,在您的视图控制器中,您需要具有一个属性
@property (strong, nonatomic) CBPeripheral *activePeripheral; @属性(强,非原子)CBPeripheral * activePeripheral;
Assign found peripheral to activePeripheral, after which do your staff (connecting/discovering/etc...) 将找到的外围设备分配给activePeripheral,之后再进行工作人员(连接/发现/等...)
I think using Framework like a CoreBluetooth is not a good way to achieve good results, you need something high level, block based. 我认为像CoreBluetooth这样使用Framework并不是取得良好结果的好方法,您需要基于块的高级功能。 Here is a library that I have just commited for you https://github.com/LGBluetooth/LGBluetooth
这是我刚刚为您提交的一个库https://github.com/LGBluetooth/LGBluetooth
It will make life with bluetooth much more easier. 它将使蓝牙的生活更加轻松。
I was able to get this working with CoreBluetooth, using an NSMutableArray to hold the objects. 我可以使用NSMutableArray来保存对象,并与CoreBluetooth一起使用。 This did the trick:
这达到了目的:
@property (strong, nonatomic) NSMutableArray *discoveredPeripherals;
//then in your didDiscoverPeripheral delegate:
if ( ![discoveredPeripherals containsObject peripheral]{
[discoveredPeripherals addObject peripheral]; //this right here retains the obj
}
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