building app connect arduino bluetooth module, finds devices fine when comes discovering services nil. im fine discover services function don't understand
here code:
import uikit import corebluetooth class devices: uitableviewcontroller, cbcentralmanagerdelegate, cbperipheraldelegate { var devices = [string]() var centralmanager : cbcentralmanager! var peripheral: cbperipheral! var central: cbcentralmanager! var peripheralarray: [cbperipheral] = [] var service : cbservice! var deviceconnected = false override func viewdidload() { super.viewdidload() self.refreshcontrol = uirefreshcontrol() self.refreshcontrol!.addtarget(self, action: "scanfordevices:", forcontrolevents: uicontrolevents.valuechanged) tableview.tablefooterview = uiview() central = cbcentralmanager(delegate: self, queue: nil) } override func didreceivememorywarning() { super.didreceivememorywarning() } func centralmanagerdidupdatestate(central: cbcentralmanager) { if central.state == cbcentralmanagerstate.poweredon { print("bluetooth on") } else { print("bluetooth off or not supported") } } func scanfordevices(sender: anyobject) { devices.removeall() print("scanning") central.scanforperipheralswithservices(nil, options: nil) dispatch_after(dispatch_time(dispatch_time_now, (int64)(2 * nsec_per_sec)), dispatch_get_main_queue()) { self.central.stopscan() self.refreshcontrol?.endrefreshing() print("stopped scanning") } } func centralmanager(central: cbcentralmanager, diddiscoverperipheral peripheral: cbperipheral, advertisementdata: [string : anyobject], rssi: nsnumber) { (advertisementdata nsdictionary).objectforkey(cbadvertisementdatalocalnamekey) as? nsstring let list = string(peripheral.name!) if (devices.contains(list)){ } else {devices.append(list) peripheralarray.append(peripheral) } tableview.reloaddata() } override func tableview(tableview: uitableview, numberofrowsinsection section: int) -> int { return devices.count } override func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell { let cell = tableview.dequeuereusablecellwithidentifier("device")! uitableviewcell cell.textlabel?.text = devices[indexpath.row] return cell } override func tableview(tableview: uitableview, didselectrowatindexpath indexpath: nsindexpath) { tableview.deselectrowatindexpath(indexpath, animated: true) if(deviceconnected == false){ self.central.connectperipheral(peripheralarray[indexpath.row], options: nil) deviceconnected = true }else{ self.central.cancelperipheralconnection(peripheralarray[indexpath.row]) deviceconnected = false } discoverservices() self.peripheral = peripheralarray[indexpath.row] print(self.peripheral.services) } func discoverservices(){ service in peripheral.services! { let thisservice = service as? cbservice if let thisservice = thisservice{ peripheral.discovercharacteristics(nil, forservice: thisservice) } } } }
you going straight characteristic discovery without discovering services first. before call discovercharacteristics need call discoverservices. once services have been discovered, peripheral:diddiscoverservices: delegate method called , can use trigger characteristic discovery.
for discoverservices call, can either pass array of cbuuid addresses want discover (recommended) or, if don't know services want, can pass nil discover services has.
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