twisted.positioning.nmea module documentationtwisted.positioning
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Classes for working with NMEA 0183 sentence producing devices. This standard is generally just called "NMEA", which is actually the name of the body that produces the standard, not the standard itself..
For more information, read the blog post on NMEA by ESR (the gpsd maintainer) at http://esr.ibiblio.org/?p=801. Unfortunately, official specifications on NMEA 0183 are only available at a cost.
More information can be found on the Wikipedia page: https://en.wikipedia.org/wiki/NMEA_0183.
The official standard may be obtained through the NMEA's website: http://www.nmea.org/content/nmea_standards/nmea_0183_v_410.asp.
| Present Since | 14.0 | |
| Class | GPGGAFixQualities | The possible fix quality indications for GPGGA sentences. |
| Class | GPGLLGPRMCFixQualities | The possible fix quality indications in GPGLL and GPRMC sentences. |
| Class | GPGSAFixTypes | The possible fix types of a GPGSA sentence. |
| Class | NMEAProtocol | A protocol that parses and verifies the checksum of an NMEA sentence (in
string form, not NMEASentence),
and delegates to a receiver. |
| Class | NMEASentence | An object representing an NMEA sentence. |
| Class | NMEAAdapter | An adapter from NMEAProtocol receivers to positioning receivers. |
| Function | _split | Returns the split version of an NMEA sentence, minus header and checksum. |
| Function | _validateChecksum | Validates the checksum of an NMEA sentence. |
Returns the split version of an NMEA sentence, minus header and checksum.
>>> _split(b"$GPGGA,spam,eggs*00") [b'GPGGA', b'spam', b'eggs']
| Parameters | sentence | The NMEA sentence to split. (type: bytes) |
Validates the checksum of an NMEA sentence.
| Parameters | sentence | The NMEA sentence to check the checksum of. (type: bytes) |
| Raises | ValueError | If the sentence has an invalid checksum.
Simply returns on sentences that either don't have a checksum, or have a valid checksum. |