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FastclockMasterESP8266RF/README.md

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Model Railroad Fastclock Master/Controller

This is a controller for a model railroad fastclock. That clock looks like a normal clock, but runs at a higher speed than usual. This is used to compensate the fact, that distances on the model railroad are not properly to scale, as that would need much huger locations and setup than possible.

The tasks of the master clock / controller is:

  • set the correct time
  • set the speed of the clock
  • start/stop the clock
  • inform client clocks about the current time to be displayed
  • support multiple clock systems, as we have multiple arrangements of model railroads at the same location having their own times

Principals

  • all messages are sent as broadcast messages without acknowledge on device level
  • all devices listen to all messages and filter out those messages addressed to them
  • all messages begin with a message type, to-address, from-address
  • addresses are a number in the range of 0..255
    • address 0 is reserved for master/controller
    • address 255 is reserved for a broadcast to all devices
  • if acknowledges are necessary/wanted, then separate messages needs to be applied
  • after receiving a message that needs an acknowledge, no device is allowed to send a message for a TBD. period of time except the requested device, which may send an acknowledge
  • after sending a message, the same device must wait a TBD. period of time before sending another message

Protocol

Message structure

Type To From Message
P,p,A,U,a,C,T,H,E 0..255 0..255 msg type dependent

Message definitions

Nachricht msgType Attribute Status
PairingOffering P FastclockName (8), ClockChannel Implemented
PairingRequest p ClientName(10) Implemented
PairingAck A FastclockName (8), ClientName (10), Network-Address Implemented
UnpairRequest U tbd. ---
UnpairAck a tbd. ---
FastClock C FastclockName (8), Hour, Minute, Second, ClockSpeed, Weekday Implemented
TextMessage T FastclockName (8), Message Implemented
Hello H tbd. ---
HelloEcho E RSSI, canRouteToMaster, FastclockName(8) ---

Links / References