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IEC-104 (IEC 60870-5-104) protocol specifications

Greetings. Looking for a complete map of the protocol, i.e. what telegram stands for what and what each of the bytes in these telegrams represents.
I.e. all possible ASDU, ACPI, etc.
Asked this question the official support with no success.
And I actually found this: https://github.com/boundary/wireshark/blob/master/epan/dissectors/packet-iec104.c
Is this the best I can have for a "protocol specification" or there are the better solutions?
And since wireshark already wrote this packet dissector, maybe we can help us with something more representative?
I hope so, because I'm desperate already.

Thank you in advance.

IEC-104 (IEC 60870-5-104) protocol specifications

Greetings. Looking for a complete map of the protocol, i.e. what telegram stands for what and what each of the bytes in these telegrams represents.
I.e. all possible ASDU, ACPI, etc.
Asked this question the official support with no success.
And I actually found this: https://github.com/boundary/wireshark/blob/master/epan/dissectors/packet-iec104.c
Is this the best I can have for a "protocol specification" or there are the better solutions?
And since wireshark already wrote this packet dissector, maybe we you can help us with something more representative?
I hope so, because I'm desperate already.

Thank you in advance.