MetaWear : CLI application on MACOSX - swift

Question

I am attempting to follow the MetaWear guide on starting a sample application, located here . The problem that I am quickly running into is that I am getting unexpected crashes. Here is how my code is structured
:
Lastly, my Podfile contains the following:
platform :osx, '10.12.6'
target 'meta-wear' do
use_frameworks!
pod 'MetaWear', '~> 2.9'
end
When I run the application, I get a Thread exception as follows on line 5 of the first image:
Thread 1: EXC_BAD_ACCESS (code=1, address=0x0)
While I am certainly a new Swift developer ( noob ), I have no idea why I am unable to reproduce their guide.
Xcode: 9.0
macOS Sierra Version 10.12.6 ( This is where I want to run this command line application )
Update after adding an infinite loop
I updated the main.swift class to ahve the following:
import Foundation
let runLoop = RunLoop.current;
let distantFuture = Date.distantFuture;
print("### we are in the create");
let starter = MetaWearStarter();
print("### we are after the create");
while (runLoop.run(mode: RunLoopMode.defaultRunLoopMode, before: distantFuture)){
print("### listening for a metawear device");
}
I created a class called MetaWearStarter.swift as follows:
import Foundation
import MetaWear
class MetaWearStarter : NSObject {
override init() {
super.init();
print("### we are in the init");
startConnection();
}
func startConnection() {
print("##### connection call was made");
let manager = MBLMetaWearManager.shared();
maanger.startScanForMetaWears() { array in
print("### connection scan was complete")
// Hooray! We found a MetaWear board, so stop scanning for more
MBLMetaWearManager.shared().stopScan()
// Connect to the board we found
if let device = array.first {
device.connectAsync().success() { _ in
print("#### we connected to a device");
}.failure() { error in
print("### unable to connect");
}
}
}
}
}
I get the previous error on this line:
let manager = MBLMetaWearManager.shared();
And my output never makes it past that line:
### we are in the create
### we are in the init
##### connection call was made

Answer 1

An infinite loop to keep the runloop running is not a good habit.
Add a completion handler to your class and stop the runloop on completion.
The usual way to handle the run loop in a CLI is this:
import Foundation
import MetaWear
class MetaWearStarter {
let manager = MBLMetaWearManager.shared()
func startConnection(completion: #escaping (String)->()) {
print("##### connection call was made");
manager.startScanForMetaWears() { array in
print("### connection scan was complete")
// Hooray! We found a MetaWear board, so stop scanning for more
manager.stopScan()
// Connect to the board we found
if let device = array.first {
device.connectAsync().success() { _ in
completion("#### we connected to a device")
}.failure() { error in
completion("### unable to connect, error: \(error.localizedDescription)")
}
} else {
completion("#### no device found")
}
}
}
}
let starter = MetaWearStarter()
let runLoop = RunLoop.current
starter.startConnection { (result) in
print(result)
CFRunLoopStop(runLoop.getCFRunLoop())
}
runLoop.run()
exit(EXIT_SUCCESS)