No output to serial port

[brightproject]

Hello @flybrianfly
Please tell me, have you tried running the library with such an ancient and godforsaken module as NEO-6M?
Perhaps the problem is related to the NEO-6M module itself, but perhaps also to the version of the UBX protocol in it ... perhaps the version is outdated, the module shows through the u-center software 7.03 (45969).
First, I configure the module through the u-center at 5 Hz (tried it at 10 Hz).

Although according to the datasheet for NEO-6M

up to 1 Hz is possible and the y-center highlights the field in red, in the binary console there is a noticeable change in the output speed, but on the module itself the red LED always blinks with the same frequency - 1 Hz.
I also disabled all NMEA and UBX messages and enabled only three: VEDNED, POSLLH, SOL.

Code, upload to stm32f411

#include "ubx.h"

#define SERIAL_BAUD 115200
#define GNSS_BAUD 115200

HardwareSerial Serial2(USART2); // PA2(TX2), PA3(RX2)

bfs::Ubx gnss(&Serial2);

void setup() {
  /* Serial to display data */
  Serial.begin(SERIAL_BAUD);
  while(!Serial) {}
  gnss.Begin(GNSS_BAUD);
}

void loop() {

  // forwarding serial2 to serial
  // if (Serial2.available() > 0)
  // Serial.write(Serial2.read());
  // Serial2.write(Serial.read());

  delay(20);

  if(gnss.Read()) {
    Serial.print(gnss.fix());
    Serial.print("\t");
    Serial.print(gnss.num_sv());
    Serial.print("\t");
    Serial.print(gnss.lat_deg(), 6);
    Serial.print("\t");
    Serial.print(gnss.lon_deg(), 6);
    Serial.print("\t");
    Serial.print(gnss.alt_wgs84_m(), 2);
    Serial.print("\n");
  }
}

Compile is OK

There is peace and quiet in the port ...
None of the existing libraries want to work with this module.
I can only read data from the module using a self-written parser, but the parser has a drawback - it does not work if a delay is added to the parser code, even 10 ms, and the messages are no longer parsed.
Therefore, I want to make the module work with normal UBX parsing libraries.
Therefore, I cannot add a filter library to the parser code and update it.
The data simply will not be updated and entered into the filter.
A vicious circle and probably a way out of it is the purchase of a modern module from Ublox.