WARN2020.02.21 14:50:06Received a sentence with an invalid checksum. The second, third, etc always has the wrong one. The first message has the correct checksum. I can provide more examples if needed but what I have noticed is that the GSV is a multi-part message. Received a sentence with an invalid checksum: What Iâm finding is that the 2nd of 2 msgs always has the wrong checksum. When unchecked allows the user to ignore NMEA checksum values and still. Iâm running multiple Reach RS+ (2.22.1) units and recently started parsing the *GSV NMEA strings. The NMEA-0183 interface standard is 4800 baud, eight (8) data bits, no parity. Likewise, your code for computing the checksum: bool done = false can be turned into something like this: for (int i=0 i<< "\ncomputed checksum: " << std::hex << (int)check << "\n" Std::cout << "received checksum: " << received_checksum Print out both the received and computed checksums: Save the checksum that was at the end of what we received.Ĭhar check = std::accumulate(sentence.begin()+1, sentence.end(), 0, My immediate reaction would be to write code something like this: #include I believe this can be simplified quite a bit. Ifstream Cheat1("Amateur Hour.txt", ios::in | ios::binary) Ofstream Cheat("Amateur Hour.txt", ios::out | ios::app) Hex Checksum to Binary Conversion (messy, but does the job) Store individual characters in an element of an vector Here's an example of the type of message: !AIVDM,1,1,A,13HOI:0P0000VOHLCnHQKwvL05Ip,0*23 Is there a better way of handling the "Store individual characters in vector" section? I went that way because the message can be of variable size (plus 1 or 2 characters). I tried for a good day to do it with tables etc, but in frustration I ended up going with this. In particular, the hex-to-binary section, the checksum is in hex, and the rest is in ASCII. I was hoping for a bit of advice on cleaning a couple of areas of this code up.
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