2.2.2.6.3 rdsParamContentSize
The value of the rdsParamContentSize field MUST be the length, in bytes, of the value of the rdsParamContentSize field's containing rdsParamGroup field minus the length, in bytes, of the value of the rdsParamContentSize field's containing rdsParamHeader. The number obtained appears in the message as a decimal string.
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rdsParamContentSize = NUMBER