beremiz

Add retain basic implementation on GNU/Linux

2018-06-07, Andrey Skvortsov
976841968d74
Add retain basic implementation on GNU/Linux

Retain is saved in file and backup of this file is done every time.
File isn't saved on every PLC cycle to avoid high I/O load.
By default, retain is saved every second and on PLC stop/shutdown.
It's possible to override retain flush period by using CFLAGS option
in project's settings. For example, for 0.5 seconds period
use "-DFILE_RETAIN_SAVE_PERIOD_S=0.5".
Crossbar test router configuration is available in .crossbar directory.
Starting command:
crossbar start
This project contains wamp client config to be loaded at runtime startup.
project_files/wampconf.json
wampconf.json is in "Project Files", so it is copied to runtime's working directory, and then loaded after program transfer + runtime restart.
Otherwise, wamp config file path can be forced :
./Beremiz_service.py -c /path/to/my/wampconf.json /working/dir
Otherwise, path for CRA secret can be forced :
./Beremiz_service.py -s /path/to/my/secret /working/dir
Tested on version:
Crossbar.io : 17.12.1 (Crossbar.io COMMUNITY)
Autobahn : 17.10.1 (with JSON, MessagePack, CBOR, UBJSON)
Twisted : 17.9.0-EPollReactor
LMDB : 0.93/lmdb-0.9.18
Python : 2.7.12/CPython