does not implement -[peripheral:didModifyServices:] about cordova-plugin-bluetoothle

[sdetweil]

I think an example of the didModifyServices delegate would be

- (void)peripheral:(CBPeripheral *)peripheral  didModifyServices:_ {
      NSMutableArray *noSpecifiedServices = [NSMutableArray new];
      // discover all the services . I think this is the one we want.. as we are in a generic plugin.. 
      [peripheral discoverServices:noSpecifiedServices];
  }

the note on the didModifyServices is

When the peripheral discovers one or more services, it calls the [peripheral(_:didDiscoverServices:)]
(https://developer.apple.com/documentation/corebluetooth/cbperipheraldelegate/1518744-peripheral): method of its 
delegate object. After a peripheral discovers services, you can access them through the peripheral’s [services]
(https://developer.apple.com/documentation/corebluetooth/cbperipheral/1518978-services) property.

which says UNLESS this delegate is provided AND discovers the services, you CANNOT access them

[sdetweil]

I added the didModifyServices delegate, no longer get the error, but don't get the new service detected...

[sdetweil]

well, there is a small doc that says the device MUST have the two default services

As you can see, even before we have done anything, **there are already two mandatory services** set up for us:

[The Generic Access service](https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.generic_access.xml). Service UUID 0x1800. Three mandatory characteristics:

[Characteristic: Device name](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.gap.device_name.xml). UUID 0x2A00.
[Characteristic: Appearance](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.gap.appearance.xml). UUID 0x2A01.
[Characteristic: Peripheral Preferred Connection Parameters](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.gap.peripheral_preferred_connection_parameters.xml). UUID 0x2A04.
[The Generic Attribute service](https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.generic_attribute.xml). UUID 0x1801. One optional characteristic:

[Characteristic: Service Changed](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.gatt.service_changed.xml). UUID 0x2A05.
The Generic Access Service contains general information about the device. You can recognize a characteristic holding the device name “OurService”. The second characteristic holds the appearance value and in our case we haven't set the value to anything so it just shows 0x0000. The third characteristic holds various parameters used to establish a connection. You can recognise values from the #defines in the example called: MIN_CONN_INTERVAL, MAX_CONN_INTERVAL, SLAVE_LATENCY, and CONN_SUP_TIMEOUT. [Here](https://devzone.nordicsemi.com/question/60/what-is-connection-parameters/) is a short explanation regarding these parameters.

The second service is the Generic Attribute Service. Simply put, this service can be used to notify the central of changes made to the fundamental structure of services and characteristics on the peripheral. Short explanation [here](https://devzone.nordicsemi.com/question/15099/changing-gatt-characteristic-properties/).

I didn't add those 'mandatory' services