@startuml
Title AT Mode

state CellularBSP {
  UartIrq: Reads data with DMA to static buffer
  UartIrq: and packs them into struct with result code.
  UartIrq --> SendToWorker
  SendToWorker: Puts structured data into workers MessageBuffer.
  SendToWorker --> output

  state output <<exitPoint>>
}

state CellularWorker{
  state DMAMessageBuffer <<expansionInput>> 

  DMAMessageBuffer --> ATParser
  ATParser: Parses URC packages.
  ATParser --> CmdAwaitingResponse
  
  state CmdAwaitingResponse <<choice>>
  CmdAwaitingResponse ----> outputWorker : True
  CmdAwaitingResponse --> CheckIfFOTA : False

  CheckIfFOTA --> StoreURC : False
  CheckIfFOTA --> FotaService : True

  state outputWorker <<exitPoint>>
}

output --> DMAMessageBuffer

state Channel {
  state ATBuffer <<expansionInput>>
  
  ATBuffer --> ATStream 
  ATStream: parses AT message
  
  ATStream --> channelOutput

  state channelOutput <<exitPoint>>
}

outputWorker --> ATBuffer
channelOutput --> ServiceCellular
@enduml