Message decoding failed about pyais HOT 2 CLOSED

Message decoding failed. Please check what is wrong, Thanks!

from pyais.

The error message is pretty clear. You passed a multi part message - several NMEA messages form a single AIS message - to the decode method. But you only passed the first part. Therefore, the message payload can not be decoded, because it missing parts of its content.

You can see this in the message itself. The message starts with !AIVDM,2,1,1,B, which means:

• !AIVDM identifies the message as an AIVDM message
• 2: the current message as two fragments
• 1: the current message is the first fragment (part) of a total of two fragments (parts)
• 1: the sequential message ID is one (for multi sentence AIS messages)

As you can see, the full message consists of two individual fragments. Each fragment is a single NMEA sentence. Both fragments taken together contain the payload of the message. Each fragment on its own is worth more or less nothing. Thus the decode() method expects all fragments.

from pyais.