go-rscp & e3dc command line utility

Go library (rscp) and command line utility (e3dc) to communicate with a E3DC system implementing the RSCP (Remote Storage Control Protocol).

Please be gentle with me, this is my first real go project and it's bigger than I thought ;) There is still a lot to improve to be a good reusable library, but most works for my specific usecase using it as a command line utility. Contributions are very welcome, see also the check TODO or search in the code for TODO: comments.

Usage

All arguments can also be set as E3DC_ prefixed environment variable or in a config file like:

host 127.0.0.1
user myuser
password mypassword
key mykey

request sent, is always last argument or can be piped through stdin as json string.

See the examples below for more information.

Examples

Note: top element has always to be an array

Note: these examples assume you have the default .config file setup or exported the environment variables.

Note: all example use the default output format, check the help ./e3dc -help for other formats.

• Short tag only notation just request some information

  ./e3dc '[["EMS_REQ_START_MANUAL_CHARGE",0]]' | jq

  Output:

  {
    "EMS_START_MANUAL_CHARGE": true
  }

• Short tag only notation just request some information

  ./e3dc '["INFO_REQ_MAC_ADDRESS", "INFO_REQ_UTC_TIME"]' | jq

  Output:

  {
    "INFO_MAC_ADDRESS": "00:00:00:00:00:00",
    "INFO_UTC_TIME": "1970-01-01T00:00:00.000000Z"
  }

• Tuple notation of tag's to request information

  ./e3dc '[["INFO_REQ_MAC_ADDRESS"], ["INFO_REQ_UTC_TIME"]]' | jq

  Output:

  {
    "INFO_MAC_ADDRESS": "00:00:00:00:00:00",
    "INFO_UTC_TIME": "1970-01-01T00:00:00.000000Z"
  }

• Tuple notation of tag's and values to send information (data type is inferred by the tag)

  ./e3dc '[["EMS_REQ_START_MANUAL_CHARGE", 3000]]' | jq

  Output:

  {
    "EMS_START_MANUAL_CHARGE": true
  }

• Tuple notation of tag's and values to send information (with explicit data type)

  Note: wrong data type is corrected by inferring it from the tag

  ./e3dc '[["INFO_REQ_MAC_ADDRESS","None",""], ["INFO_REQ_UTC_TIME"]]' | jq

  Output:

  {
    "INFO_MAC_ADDRESS": "00:00:00:00:00:00",
    "INFO_UTC_TIME": "1970-01-01T00:00:00.000000Z"
  }

TODO

• more testing
• more documentation
• check the generic data type logic (i.e. pointer vs value in interface), this should do a pro ;)
• cmd/e3dc
  • read config file (security)
  • read from environment variables (security)
  • streamline logging
  • optional experimental mode which accepts any custom message (including tag, datatype and value)
  • implement optional (by flag) pair output (same as the tuple input without datatype)
• rscp
  • cleanup API
    • probably expose Message as interface and make the struct internal (would allow to move the complete cmd/e3dc specific json stuff out)
  • streamline logging
  • client: improve implementation to make it stable for keeping stable and connected when used in a service
  • move cmd/e3dc specific json marshalling out of rscp to command line utility cmd/e3dc
  • move cmd/e3dc specific json unmarshaling out of rscp to command line utility cmd/e3dc