A user$-$A $(+447826123456)$ sends a message $($The module result is on $13$ Dec $2024)$ to a user$-$B $(+447920963852).$ First, a user$-$A converts the message to a PDU format and sends it to the access point AP$-1.$ Then, AP$-1$ sends it to AP$-2$ over a wireless channel using FHSS with channel switching pattern$/$sequence of $0312.$ A maximum of $3$ bytes can be sent over each channel in a unit time. User$-$B converts the PDU message back to text upon receiving it$.$ Describe the following in detail: a$.$ Each step of the conversion process from Text$-$to$-$PDU and assembling of a final transmittable PDU data including all fields $($e$.$g$.$ sender$/$receiver numbers, flags, data, etc$).$

Show the process of fragmentation and defragmentation at AP$-1$ and AP$-2$ using FHSS and bytes$/$characters on each channel during the transmission.

Each step of the conversion process from PDU$-$to$-$Text to show the final received message including all fields $($e$.$g$.$ sender$/$receiver numbers, flags, data, etc$)$