Dart warnings on startup

[jimhar8]

Cosmos 4.5.0

Hi, we have installed Postgresql and installed Dart per install

We are attempting to use our target timestamp by following this article:

packet_time

This is the telemetry definition header we are using:

  APPEND_ID_ITEM PROCID 16 UINT <%= procid %> "Process ID"
  APPEND_ID_ITEM PACKETID 16 UINT <%= packetid %> "Packet ID"
  APPEND_ITEM TLM_SEQCNT 16 UINT "Telemetry Sequence counter"
  APPEND_ITEM CMD_SEQCNT 16 UINT "Command Sequence counter for initiated telemetry"
  APPEND_ITEM TIMESEC 32 UINT "Seconds since epoch (January 1st, 1970, midnight)"
  APPEND_ITEM TIMEUS 32 UINT "Microseconds of second" 
  APPEND_ITEM PACKET_TIME 0 DERIVED "Ruby time based on TIMESEC and TIMEUS" BIG_ENDIAN
        READ_CONVERSION unix_time_conversion.rb TIMESEC TIMEUS

Upon startup we get some warnings in log about PACKET_TIME not being supported by DART.
2021_07_12_06_44_54_server_messages_sanitized.txt

The warning messages don't seem to be persistent. Telemetry screens seem to be showing correct timestamps.

Is this to be expected? Will Dart still be using the derived timestamp?

Thanks

[ghost]

I assume you're talking about this message:

2021/07/12 06:44:54.020  WARN: Read Conversion UnixTimeConversion on item PACKET_TIME does not specify converted type or bit size. Will not be supported by DART

This is due to using the UnixTimeConversion. Apparently we did not set the converted_type or converted_bit_size in that class which would have prevented this warning. This concept is explained in the Derived Items post.

Thanks for raising this issue as the core COSMOS classes should support this feature. We've been focused on COSMOS 5 for quite some time so I'm not sure when we will get around to addressing this but you can subclass UnixTimeConversion and add the converted_type and converted_bit_size to your subclass to avoid this warning.

[jimhar8]

Thank you. What would be the converted type? The UnixTimeConversion returns Ruby Time object and I was thinking type had to be one of these: [:INT, :UINT, :FLOAT, :STRING, :BLOCK]. What would we use for converted_bit_size?

Would Dart and PACKET_TIME still work if we leave things as-is? That is with the warnings?

[ghost]

It returns a float of the seconds so :FLOAT 32.

[ghost]

You should be using UnixTimeFormattedConversion or UnixTimeSecondConversion. They both properly implement the converted_type and converted_bit_size. UnixTimeConversion is simply a base class.