Hi,
I try to set the code in the setup and wait for almost one hour, but it seems that still not turn into periodic mode according to the GPGGA timestamp?
MicroNMEA::sendSentence(gps,"$PSTMLOWPOWERONOFF,1,0,0,0,0,0,0,3,30,2,1,1,15,180");
initially, I put this line of code in the setup loop, and I think I did not see the '$PSTMLOWPOWERON,.. from the serial monitor. But now, I put the code in the loop, so it will launch the code every loop and I can see the '$PSTMLOWPOWERON,.. right now. It is correct? Thank you
and for the message read from the serial monitor after the code is just uploaded 
Do I miss something?
//NOTE: for compatibility with the Arduino Due some additional cabling needs to be performed:
// pin D8 should be connected to pin D18 and pin D2 should be connected to pin D19
#include <MicroNMEA.h>
//Define Serial1 for STM32 Nucleo boards
#ifdef ARDUINO_ARCH_STM32
HardwareSerial Serial1(PA10, PA9);
#endif
#define RESET_PIN 7
// Refer to serial devices by use
HardwareSerial& console = Serial;
HardwareSerial& gps = Serial1;
//MicroNMEA library structures
char nmeaBuffer[100];
MicroNMEA nmea(nmeaBuffer, sizeof(nmeaBuffer));
bool ledState = LOW;
volatile bool ppsTriggered = false;
void ppsHandler(void);
void ppsHandler(void)
{
ppsTriggered = true;
}
void gpsHardwareReset()
{
// Empty input buffer
while (gps.available())
gps.read();
//reset the device
digitalWrite(RESET_PIN, LOW);
delay(50);
digitalWrite(RESET_PIN, HIGH);
//wait for reset to apply
delay(2000);
}
void setup(void)
{
console.begin(115200); // console
gps.begin(9600); // gps
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, ledState);
//Start the module
pinMode(RESET_PIN, OUTPUT);
digitalWrite(RESET_PIN, HIGH);
console.println("Resetting GPS module ...");
gpsHardwareReset();
console.println("... done");
// Change the echoing messages to the ones recognized by the MicroNMEA library
Serial.println("11111111111111");
MicroNMEA::sendSentence(gps, "$PSTMSETPAR,1201,0x00000042");
Serial.println("22222222222222");
MicroNMEA::sendSentence(gps, "$PSTMSAVEPAR");
delay(2000);
Serial.println("33333333333333333");
MicroNMEA::sendSentence(gps,"$PSTMLOWPOWERONOFF,1,0,0,0,0,0,0,3,30,2,1,1,15,180");
//Reset the device so that the changes could take plaace
Serial.println("44444444444444444");
MicroNMEA::sendSentence(gps, "$PSTMSRR");
Serial.println("55555555555555555");
MicroNMEA::sendSentence(gps,"$PSTMLOWPOWERONOFF,1,0,0,0,0,0,0,3,30,2,1,1,15,180");
delay(4000);
//clear serial buffer
while (gps.available())
gps.read();
pinMode(6, INPUT);
attachInterrupt(digitalPinToInterrupt(6), ppsHandler, RISING);
//MicroNMEA::sendSentence(gps,"$PSTMLOWPOWERONOFF,1,0,0,0,0,0,0,3,30,2,1,1,15,180");
}
int i = 0;
void loop(void)
Hi, according to my code, I think I send the command "$PSTMLOWPOWERONOFF. However, I do not see the '$PSTMLOWPOWERON,...' answer from the serial monitor...
Thank you
