NodeMCU ESP8266-12E and GPS Neo 6M

Question

I have wired my ESP-12E and my GPS according to the wiring provided in this link.

However, no GPS led turned on or blinked. Additionnally to powering the GPS directly with the 3.3V supplied by the ESP, I also tried powering the GPS with a 5V power supply but nothing changed.

Could someone confirm that, as nothing turns on, it is probably a hardware issue? In other words, should a led turn on or blink if the GPS module is powered (even if the TX and RX are not connected)?

EDIT: I also followed this link and wired the GPS module to my Raspberry Pi, put it outside but got nothing too.

EDIT: below is what I could finally get (only twice) by running `sudo cat /dev/ttyAMA0':

 pi@raspberrypi:~ $ sudo cat /dev/ttyAMA0 
$GPTXT,01,01,02,u-blox ag - www.u-blox.com*50

$GPTXT,01,01,02,HW  UBX-G60xx  00040007 FF7FFFFFp*53

$GPTXT,01,01,02,ROM CORE 7.03 (45969) Mar 17 2011 16:18:34*59

$GPTXT,01,01,02,ANTSUPE$GPTXT,01,01,02,u-blox ag - www.u-blox.com*50

$GPTXT,01,01,02,HW  UBX-G60xx  00040007 FF7FFFFFp*53

$GPTXT,01,01,02,ROM CORE 7.03 (45969) Mar 17 20�$GPTXT,01,01,02,u-blox ag - www.u-blox.com*50

$GPTXT,01,01,02,HW  UBX-G60xx  00040007 FF7FFFFFp*53

$GPTXT,01,01,02,ROM CORE 7.03 (45969) Mar 17 2011 16:18:34*59

$GPTXT,01,01,02,ANTSUPERV=AC SD PDoS SR*20

$GPTXT,01,01,02,ANTSTATUS=DONTKNOW*33

$GPRMC,,V,,,,,,,,,,N*53

$GPVTG,,,,,,,,,N*30

$GPGGA,,,,,,0,00,99.99,,,,,,*48

$GPGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*30

$GPGSV,1,1,00*79

$GPGLL,,,,,,V,N*64

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPRMC,,V,,,,,,,,,,N*53

$GPVTG,,,,,,,,,N*30

$GPGGA,,,,,,0,00,99.99,,,,,,*48

$GPGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*30

$GPGSV,1,1,00*79

$GPGLL,,,,,,V,N*64

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,02,ANTSTATUS=INIT*25

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

$GPTXT,01,01,01,NMEA unknown msg*58

and

pi@raspberrypi:~ $ sudo cat /dev/ttyAMA0 
$GPTXT,01,01,02,u-blox ag - www.u-blox.com*50

$GPTXT,01,01,02,HW  UBX-G60xx  00040007 FF7FFFFFp*53

�$GPTXT,01,01,02,u-blox ag - www.u-blox.com*50

$GPTXT,01,01,02,HW  UBX-G60xx  00040007 FF7FFFFFp*53

$GPTXT,01,01,02,ROM CORE 7.03 (45969) Mar 17 2011 16:18:34*59

$GPTXT,01,01,02,ANTSUPERV=AC SD PDoS SR*20

$GPTXT,01,01,02,ANTSTATUS=DONTKNOW*33

$GPRMC,,V,,,,,,,,,,N*53

$GPVTG,,,,,,,,,N*30

$GPGGA,,,,,,0,00,99.99,,,,,,*48

$GPGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*30

$GPGSV,1,1,00*79

$GPGLL,,,,,,V,N*64