Q&A

[brucebookman]

Single Messages
"Supports single messages": Can someone recommend a library that decodes multi-line messages. Or is there a work around that can leverage pyais?

I have code that can collate the message parts and put them all together in any manner a library might require. All I need is one that then can decode.

Message types
"Currently, this module is able to decode most message types. There are only a few exceptions. "

Which specific messages are not decoded? I have a close to production need to decode everything. Any plan to add the messages types that are currently not decoded?

[brucebookman]

P.S. libais, which is kinda out of date, seems to be able to decode every message type. Could you use that as a guide?

[M0r13n]

Hey there,

pyais supports multi line messages. A simple example can be found here

Regarding your question of supported messages:

It supports all message types. But it can not decode message specific payloads. This should be done by the user.

[brucebookman]

Oh this is fantastic news. Sorry I did not read carefully. Thank you so much

…

On Tue, May 25, 2021 at 10:03 AM Leon Morten Richter < ***@***.***> wrote: Hey there, pyais supports multi line messages. A simple example can be found here <https://pyais.readthedocs.io/en/latest/examples/single.html> Regarding your question of supported messages: It supports all message types. But it can not decode message specific payloads. This should be done by the user. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#31 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ASV6NX3LMWHPV5CIWZPBPV3TPPJ7XANCNFSM45PUZ5BA> .

[brucebookman]

Can you elaborate on this "But it can not decode message specific payloads". Perhaps give an example of where the specific payload is not decoded On Tue, May 25, 2021 at 1:13 PM Bruce Bookman ***@***.***> wrote:

…

Oh this is fantastic news. Sorry I did not read carefully. Thank you so much On Tue, May 25, 2021 at 10:03 AM Leon Morten Richter < ***@***.***> wrote: > Hey there, > > pyais supports multi line messages. A simple example can be found here > <https://pyais.readthedocs.io/en/latest/examples/single.html> > > Regarding your question of supported messages: > > It supports all message types. But it can not decode message specific > payloads. This should be done by the user. > > — > You are receiving this because you authored the thread. > Reply to this email directly, view it on GitHub > <#31 (comment)>, or > unsubscribe > <https://github.com/notifications/unsubscribe-auth/ASV6NX3LMWHPV5CIWZPBPV3TPPJ7XANCNFSM45PUZ5BA> > . >

[M0r13n]

This applies to messages of type 6, 8, 25, and 26. These messages have in common, that they contain unspecified binary payload.

• Message type 6: data field with up to 920 bits of binary payload
• Message type 8: data field with up to 952 bits of binary payload
• Message type 26: data field with up to 128 bits of binary payload
• Message type 27: data fiield with up to 1004 bits of binary payload

The decoding of the binary payload is message dependent and varies between different systems. If we want to decode the binary payload of message type 6, we firstly would have to look at the dac (Designated Area Code) and the fid (Functional ID). Dependening of their values, we would know, how to interpret the payload.

There are a lot of different application-specific messages, which are more or less standardized. Therefore pyais does not even try to decode the payload. Instead, you can access the raw payload as a bit-string or a bitarray.

[brucebookman]

Thank you for the clarification. I'd recommend adding that detail to the readme. And thanks for the great library!

…

On Fri, May 28, 2021 at 3:59 AM Leon Morten Richter < ***@***.***> wrote: This applies to messages of type 6, 8, 25, and 26. These messages have in common, that they contain unspecified binary payload. - Message type 6: data field with up to 920 bits of binary payload - Message type 8: data field with up to 952 bits of binary payload - Message type 26: data field with up to 128 bits of binary payload - Message type 27: data fiield with up to 1004 bits of binary payload The decoding of the binary payload is message dependent and varies between different systems. If we want to decode the binary payload of message type 6, we firstly would have to look at the dac (Designated Area Code) and the fid (Functional ID). Dependening of their values, we would know, how to interpret the payload. There are a lot of different application-specific messages, which are more or less standardized. Therefore pyais does not even try to decode the payload. Instead, you can access the raw payload as a bit-string or a bitarray. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#31 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ASV6NX6RJSBQNXURANCNOELTP5ZPTANCNFSM45PUZ5BA> .

[M0r13n]

You are totally right. I will do this as soon as I can. I'll keep this issue open until then as a reminder for myself.

[M0r13n]

Closed with #35.