how to decode message type 5?Looks like this package is having issues with multi part messages

[bertoldvdb]

how to decode message type 5?Looks like this package is having issues with multi part messages

[BertoldVdb]

Can you give an example of a failing multipart message? I tried it with these two and it seems ok:
`
!AIVDM,2,1,6,B,53Jmvl82Bw3CTP7??K5<D5<lThF222222222221:I0oK;4e20L3FH42i,0*5C

!AIVDM,2,2,6,B,p88888888888880,2*69
`

[sujunbo]

Hello, message type 5 doesn't seem to be parsing.

message: !AIVDM,2,1,6,B,53Jmvl82Bw3CTP7??K5<D5<lThF222222222221:I0oK;4e20L3FH42i,0*5C

[BertoldVdb]

Hello, Do you feed the second part of the message also? Otherwise it cannot be decoded. Sincerely, Bertold Op wo 21 jul. 2021 06:03 schreef 苏俊波 ***@***.***>:

…

[image: image] <https://user-images.githubusercontent.com/37428938/126428855-5fc48254-0356-4c00-b663-b34f80887b93.png> Hello, message type 5 doesn't seem to be parsing. message: !AIVDM,2,1,6,B,53Jmvl82Bw3CTP7??K5<D5<lThF222222222221:I0oK;4e20L3FH42i,0*5C — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#7 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABQILGMFHLY67XDJMLSFQYDTYZBHNANCNFSM4Y2QEI5Q> .

[sujunbo]

Hello, Do you feed the second part of the message also? Otherwise it cannot be decoded. Sincerely, Bertold Op wo 21 jul. 2021 06:03 schreef 苏俊波 @.**>:
…
[image: image] https://user-images.githubusercontent.com/37428938/126428855-5fc48254-0356-4c00-b663-b34f80887b93.png Hello, message type 5 doesn't seem to be parsing. message: !AIVDM,2,1,6,B,53Jmvl82Bw3CTP7??K5<D5<lThF222222222221:I0oK;4e20L3FH42i,05C — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#7 (comment)>, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABQILGMFHLY67XDJMLSFQYDTYZBHNANCNFSM4Y2QEI5Q .

Do you know this website? https://www.maritec.co.za/tools/aisvdmvdodecoding

The decoder can't parse the message and put it on the above url. What is the reason for this?

[BertoldVdb]

Hello, Your message is a multipart message, as seen from the AIVDM header: *!AIVDM,2,1,6,B,...* This means it is message 1 from 2 total (with sequence number 6). It seems the maritec decoder can handle truncated messages. This library doesn't do that. Just feed the second part also and you should get the full decode message when you have input all parts. In case you don't have the second part, here is one that works with this message you can use for testing: !AIVDM,2,2,6,B,888888888888880,2*21 You can use the following example to decode your message: ``` package main import ( "fmt" "github.com/BertoldVdb/go-ais" "github.com/BertoldVdb/go-ais/aisnmea" ) func main() { nm := aisnmea.NMEACodecNew(ais.CodecNew(false, false)) decoded, _ := nm.ParseSentence("!AIVDM,2,1,6,B,53Jmvl82Bw3CTP7??K5<D5<lThF222222222221:I0oK;4e20L3FH42i,0*5C") if decoded != nil { fmt.Printf("1: %+v\n", decoded.Packet) } decoded, _ = nm.ParseSentence("!AIVDM,2,2,6,B,888888888888880,2*21") if decoded != nil { fmt.Printf("2: %+v\n", decoded.Packet) } } ``` This is the output: 2: {Header:{MessageID:5 RepeatIndicator:0 UserID:229474000} Valid:true AisVersion:2 ImoNumber:9632820 CallSign:9HA3361 Name:SEASMILE Type:74 Dimension:{A:200 B:55 C:27 D:11} FixType:1 Eta:{Month:2 Day:26 Hour:2 Minute:0} MaximumStaticDraught:11.2 Destination:MY PKD Dte:false Spare:false} Sincerely, Bertold

…

On Thu, Jul 22, 2021 at 8:04 AM 苏俊波 ***@***.***> wrote: Hello, Do you feed the second part of the message also? Otherwise it cannot be decoded. Sincerely, Bertold Op wo 21 jul. 2021 06:03 schreef 苏俊波 *@*.** *>: … <#m_3321456165003469706_> [image: image] https://user-images.githubusercontent.com/37428938/126428855-5fc48254-0356-4c00-b663-b34f80887b93.png <https://user-images.githubusercontent.com/37428938/126428855-5fc48254-0356-4c00-b663-b34f80887b93.png> Hello, message type 5 doesn't seem to be parsing. message: !AIVDM,2,1,6,B,53Jmvl82Bw3CTP7??K5<D5<lThF222222222221:I0oK;4e20L3FH42i,0*5C — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#7 (comment) <#7 (comment)>>, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABQILGMFHLY67XDJMLSFQYDTYZBHNANCNFSM4Y2QEI5Q . Do you know this website? https://www.maritec.co.za/tools/aisvdmvdodecoding The decoder can't parse the message and put it on the above url. What is the reason for this? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#7 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABQILGPCJISW4Z4NYHAT4ATTY6YINANCNFSM4Y2QEI5Q> .

[sujunbo]

您好，您的消息是多部分消息，从 AIVDM 标头中可以看出： !AIVDM,2,1,6,B,... 这意味着它是消息 1 从 2 总数（序列号为 6）。似乎 maritec 解码器可以处理截断的消息。这个图书馆不这样做。只需输入第二部分，当您输入所有部分时，您应该会收到完整的解码消息。如果您没有第二部分，这里有一个适用于您可以用于测试的消息： !AIVDM,2,2,6,B,888888888888880,221 您可以使用以下示例来解码您的消息：``` package main import ( "fmt" "github.com/BertoldVdb/go-ais" "github.com/BertoldVdb/go-ais/aisnmea" ) func main() { nm := aisnmea.NMEACodecNew(ais .CodecNew(false, false)) 解码，_ := nm.ParseSentence("!AIVDM,2,1,6,B,
…
On Thu, Jul 22, 2021 at 8:04 AM 苏俊波 @.> wrote: Hello, Do you feed the second part of the message also? Otherwise it cannot be decoded. Sincerely, Bertold Op wo 21 jul. 2021 06:03 schreef 苏俊波 @. >: … <#m_3321456165003469706_> [image: image] https://user-images.githubusercontent.com/37428938/126428855-5fc48254-0356-4c00-b663-b34f80887b93.png https://user-images.githubusercontent.com/37428938/126428855-5fc48254-0356-4c00-b663-b34f80887b93.png Hello, message type 5 doesn't seem to be parsing. message: !AIVDM,2,1,6,B,53Jmvl82Bw3CTP7??K5<D5<lThF222222222221:I0oK;4e20L3FH42i,05C — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#7 (comment) <#7 (comment)>>, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABQILGMFHLY67XDJMLSFQYDTYZBHNANCNFSM4Y2QEI5Q . Do you know this website? https://www.maritec.co.za/tools/aisvdmvdodecoding The decoder can't parse the message and put it on the above url. What is the reason for this? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#7 (comment)>, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABQILGPCJISW4Z4NYHAT4ATTY6YINANCNFSM4Y2QEI5Q .

Thanks for your reply, it helped me a lot