Do I have to wait for the didReadRSSI() function in Swift? - ios

Question

I would like to discover BLE devices in my area and store their current RSSI value. The discovering works but I'm note sure, if my func didDiscoverPeripheral is really save... I think that I should wait for the didReadRSSI func before I leave the didDiscoverPeripheral. But how can I realize that in an easy way and is my opinion right?
func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber)
{
CBperipheral = [peripheral]
peripheral.readRSSI()
}
func peripheral(peripheral: CBPeripheral, didReadRSSI RSSI: NSNumber, error: NSError?)
{
//Store the peripheral specific RSSI, Name and identifier
}

Answer 1

I would suggest something like this -
var peripherals = Set<CBPeripheral>
var peripheralRSSIs = Dictionary<CBPeripheral,NSNumber>()
func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber)
{
self.peripherals.insert(peripheral)
self.peripheralRSSIs[peripheral]=RSSI
central.connectPeripheral(peripheral,options:nil) // Connect if you want to be able to retrieve additional RSSI values
}
func centralManager(_ central: CBCentralManager,
didConnectPeripheral peripheral: CBPeripheral)
{
peripheral.delegate=self
peripheral.readRSSI()
}
func peripheral(peripheral: CBPeripheral, didReadRSSI RSSI: NSNumber, error: NSError?)
{
if (error != nil) {
print(error)
} else {
self.peripheralRSSIs[peripheral]=RSSI
}
}

Answer 2

I solved the problem like this:
func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber)
{
CBperipheral = [peripheral]
myStrings.append(StringPair("\(peripheral.name!)", "\(peripheral.name!)", "\(RSSI)"))
//Coose the right peripheral and connect!
}
I don't need very up-to-date values for the RSSI, only some guiding values. So I hope this code is conform with IOS 8 and later.
But it would be nice, if you could tell me the handling with the callback to my didReadRSSI for other problems like this.
btw. I have to write this: CBperipheral = [peripheral] to call my didConnectPeripheral after the call of CBmanager.connectPeripheral :)