[erlang-questions] Packing and unpacking iso8583 messages

[Nuku Ameyibor]

Dear List ,

I am writing a program where i need to pack/unpack iso messages .
i am using the erl8583 <https://github.com/mgwidmann/erl8583> application
but i am getting some errors using the packing and unpacking functions of
the library .
i run the  test_all.erl
<https://github.com/mgwidmann/erl8583/blob/master/test/test_all.erl>  test
script which runs the eunit scripts but got some errors .
i scaled it down and run the test_asci_marshaller.erl eunit test .
below is part of the output below

eunit:test(test_ascii_marshaller).
> test_ascii_marshaller: pan_test...*failed*
> in function erl8583_marshaller_ascii:marshal_data_element/2 (src/erl8583_marshaller_ascii.erl, line 168)
>   called as marshal_data_element({n,fixed,4},<<"0200">>)
> in call from erl8583_marshaller:marshal/2 (src/erl8583_marshaller.erl, line 108)
> in call from test_ascii_marshaller:pan_test/0 (test/test_ascii_marshaller.erl, line 43)
> **error:function_clause
>   output:<<"">>
>
> test_ascii_marshaller: proc_code_test...*failed*
> in function erl8583_marshaller_ascii:marshal_data_element/2 (src/erl8583_marshaller_ascii.erl, line 168)
>   called as marshal_data_element({n,fixed,4},<<"0100">>)
> in call from erl8583_marshaller:marshal/2 (src/erl8583_marshaller.erl, line 108)
> in call from test_ascii_marshaller:proc_code_test/0 (test/test_ascii_marshaller.erl, line 49)
> **error:function_clause
>   output:<<"">>
>
> test_ascii_marshaller: amount_tran_test...*failed*
> in function erl8583_marshaller_ascii:marshal_data_element/2 (src/erl8583_marshaller_ascii.erl, line 168)
>   called as marshal_data_element({n,fixed,4},<<"0200">>)
> in call from erl8583_marshaller:marshal/2 (src/erl8583_marshaller.erl, line 108)
> in call from test_ascii_marshaller:amount_tran_test/0 (test/test_ascii_marshaller.erl, line 55)
> **error:function_clause
>   output:<<"">>
>
>
i traced it down to this line in this line in erl8583_marshaller_ascii.erl

> marshal_data_element({n, fixed, Length}, FieldValue) when length(FieldValue) =< Length ->
> IntValue = list_to_integer(FieldValue),
> erl8583_convert:integer_to_string(IntValue, Length);
>
>
i may be wrong but seems the length(FieldValue) is being passed a binary
string instead of as string ??
running some of the functions in the application eg . below

    Msg1 = erl8583_message:new(),
>     Msg2 = erl8583_message:set(0, "0200", Msg1),
>     Msg3 = erl8583_message:set(2, "5234567890123456", Msg1),
>     AsciiMessage =erl8583_marshaller_ascii:marshal(Msg3),
>

gives the below error
 a similar example is included in the test cases and i am assuming its
supposed to work .

terminate reason: {undef,
>                       [{undefined,get_encoding,[2],[]},
>                        {erl8583_marshaller_ascii,marshal_field,3,
>                            [{file,"src/erl8583_marshaller_ascii.erl"},
>                             {line,109}]},
>                        {erl8583_marshaller,encode,6,
>                            [{file,"src/erl8583_
> marshaller.erl"},{line,238}]},
>                        {erl8583_marshaller,marshal,2,
>                            [{file,"src/erl8583_
> marshaller.erl"},{line,112}]},
>




Anyone have any experience with using this library and can help  point out
what i may be doing wrong .
Also are there any other libraries out there for packing and unpacking iso
8583 messages in erlang .
searched on github but dont seem to find anything except erl8583 and some
forks of it  .
Are there other alternative approaches for this like the use of ports  to
help with the packing/unpacking ?
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