not register ionic application on mobilefirst to use

Question

In mobile first tutorial,
one step is mfpdev app register

Question is what is the use of the registration
as I develop an ionic project and can connect to mobile first without registration when Cordova web resources Previewed with the Mobile Browser Simulator using MobileFirst command mfpdev app preview

mobile first 8
ionic 3

Answer 1

Thanks for @manjunath kallannavar for all the supports

Unrestricted right (without login) to both protected and unprotected resources lead me to confidential client.

As pre https://youtu.be/DlxZYxXszIw?t=15m40s, the author mentions user is as confidential client when using mfpdev app preview.
However, this is not documented in IBM reference. (Please quote if you find one)

Also, by using ionic cordova run android in emulator, finally challenge received.

Conclusion, with mfpdev app preview, user right = confidential client => can access all resources

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Credit to @manjunath kallannavar

Official explanation: MobileFirst Development Server includes a confidential client "test" that has an unlimited allowed scope ("*"). By default mfpdev app preview uses this confidential client.

Answer 2

mfpdev app register command will register your application with MobileFirst Server. Without registering your application with the server, the application on the mobile device will fail to connect to server with an error 'application does not exist'.

If you do not want to use mfpdev app register command, you can register your application manually at MFP Operations console.

For more details , refer : Registering an application

Update : If you are using command mfpdev app preview to preview your web resources with the Mobile Browser Simulator, Security checks are not run on the server-side and security challenges are not sent to the client that runs in Mobile Browser Simulator.

MobileFirst Development Server includes a confidential client "test" that has an unlimited allowed scope ("*"). By default mfpdev app preview uses this confidential client.

NOTE : command mfpdev app preview is meant for preview the UI , OAuth protocol is not fully supported

For more details, refer :Previewing Cordova web resources with the Mobile Browser Simulator