I added some debug log info that shows how many bytes the receiver sent between
time messages. The LEA-6T sends around 500-600 bytes every second. That fits
easily into 9600 baud. The M8N tracking all sats and with all the raw
messages enabled spews around 4000 bytes. That would require 57,600 baud.
It looks like M8N's with standard firmware are not suitable for precise
positioning. They do not output the required RAW data messages:
https://rtklibexplorer.wordpress.com/2017/06/07/newest-u-blox-m8n-receivers-not-usable-with-rtklib/
Various GPS receivers handle transmit buffer overflows in different ways...
including various combinations of dropping messages, garbling data, or
crashing. Most receivers seem to have transmit/receiver buffers in the 1000
byte range... some are smaller, some are larger.
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