my bluetooth friend, first of all it isn't necessary to disconnect current Peripheral to connect another if u want to send both messages. But many apps limit number of connected devices(CBPeripheral) to 5 - 10, because more than 5-10 connected devices, can spontaneously be lost, I know about it a little (I worked only with 4 devices). For example:
[[RKCentralManager sharedManager] scanForPeripheralsWithServices:nil options:@{CBCentralManagerScanOptionAllowDuplicatesKey:@NO} onUpdated:^(RKPeripheral *peripheral)
{
//first of all u should start a scan
[[RKCentralManager sharedManager] connectPeripheral: peripheral options:nil onFinished:^(RKPeripheral * connectedperipheral, NSError *error)
{
//after u can connect to Peripheral immediately
[connectedperipheral discoverServices:nil onFinish:^(NSError *error)
{
// services - a collection of data and associated behaviors for accomplishing a function or feature of a device
[connectedperipheral discoverCharacteristics:nil forService: [connectedperipheral.services lastObject] onFinish:^(CBService *service, NSError *error)
{
//after u should take a characteristic - Represents a service's characteristic
CBCharacteristic * characteristic = service.characteristics[0];
//and at last u can write value in characteristic in which you are going to write down something
NSData * data = [NSData dataWithHexString: newstring];
CBCharacteristicWriteType type = CBCharacteristicWriteWithoutResponse;
[connectedperipheral writeValue:data forCharacteristic:characteristic type:type onFinish:nil];
}];
}];
}];
}];
The approximate scheme of sending the message for bluetooth device, it isn't obligatory to do an investment of methods, they can be distributed on actions.
You shouldn't worry about connection and sendings data
to several devices because it is work for CBCentralManager, if U use it correctly.
CBCentralManager objects are used to manage discovered or connected remote peripheral devices (represented by CBPeripheral objects), including scanning for, discovering, and connecting to advertising peripherals.
You can connect at once some devices and send them messages, and all be ok.
If you have questions, will try to answer.
This is good example, u can see how its work : https://github.com/ruiking/ble
About max count of devices https://stackoverflow.com/a/17282862/4912496
