TD
Revision as of 21:36, 24 July 2012 by BarryCarlyon (talk | contribs) (Created the page with message information and description)
Contents
Overview
The Train Describer feed contains message about Train movements at the Signal Berth Level. Messages come in 4 types, all in JSON format:
- CA - Berth Step
- CB - Berth Cancel
- CC - Berth Interpost
- CT - Heartbeat
Messages only exist for trains of headcodes classes, 1, 2 and 9.
Messages
Messages consist of a reference key and then the main JSON string.
The Reference key is the message type followed by _MSG, all in Upper case.
Each message can contain the keys,
- to
- time, in Milliseconds
- area_id, see TD_Areas
- msg_type
- from
- descr, the Train's headcode
- report_time, eg 0842, is 9:42 in the morning,
CA
Contains: to, time, area_id, msg_type, from, descr
CB
Contains: time, area_id, msg_type, from, descr
CC
Contains: to, time, area_id, msg_type, descr
CT
Contains: time, area_id, msg_type, report_time
