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related to ATT,GATT and GAP

Hi All, Please correct the following in my understanding. Also , i am planning to build a remote controlled device using a PWM output. How does ATT,GATT and GAP affect/influence my design.

  1. ATT : - it has some value based [Individual] fields and their description is as is.

Arrays of octets From 0 to 512 octets Can be fixed or variable length

ok, what should these values be for remote controlled device, how do i know [looks like these are bluetooth forum specified values]? please help?

  1. GATT: - also in case of GATT, i understand its a bunch of attributes [individual fields/values] bundled into groups called services

for my application [remote controlled device], what should be the values of the values in that data structure ? [looks like these are bluetooth forum specified values]?

  1. GAP: - also in case of GAP, please let me know what values to transact between master [mobile device] and remote controlled device [pwm based functionality]?

  2. Also i am ruling out the security/encryption/authentication,is there any layer which comes in between [apart from ATT,GATT and GAP]?, please let me know?

Thanks

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