length of octet string type

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By youserj , 26 August, 2020
Forums
Gurux.DLMS

Hi, Mikko. Does existing limit in length octet string type, example in name of week profile table?

Kurumi

5 years 9 months ago

Hi,

It depends on the meter. DLMS standard doesn't set the max length.
In general speaking, there is a max length. Example week profile table it might be sometimes very small, only a few bytes.

BR,
Mikko

youserj

5 years 9 months ago

thank's. Why does the Python version sometimes use the ByteArray object as an octet string and sometimes use str?

Kurumi

5 years 9 months ago

Hi,

There are few reasons for this. Can you give an example so I'm sure that I'm answering your question?

BR,
Mikko

youserj

5 years 9 months ago

in object ActivityCalendar attribute calendar_name is type string and this time field week_profile_name is type bytearray, however in DLMS its both has types an octet string

Kurumi

5 years 9 months ago

Hi,

They are converted to an octet string when communicating with the device. Is your week_profile or calendar name non ASCII string?

BR,
Mikko

youserj

5 years 9 months ago

all right. both attributes are ASCII, which is convenient. simple i want understand struct of python objects in gurux.

Kurumi

5 years 9 months ago

Hi,

It's nicer to see "Summertime" than "53 75 6D 6D 65 72 74 69 6D 65". For this reason, values are shown as a string if possible. Some people want to use names like 0x1 and 0x2. In that case, values as shown as a hex string "01".

BR,
Mikko