Meshtatic firmware patch for AG3335 to keep GPS on and output full messages to USB serial

firmware.patch

diff --git a/src/gps/GPS.cpp b/src/gps/GPS.cpp
index 2beaeb127..ac70a3630 100644
--- a/src/gps/GPS.cpp
+++ b/src/gps/GPS.cpp
@@ -644,13 +644,14 @@ bool GPS::setup()
                 //  1    1       1      1   0    0
             }
             // Configure NMEA (sentences will output once per fix)
-            _serial_gps->write("$PAIR062,0,1*3F\r\n"); // GGA ON
-            _serial_gps->write("$PAIR062,1,0*3F\r\n"); // GLL OFF
-            _serial_gps->write("$PAIR062,2,0*3C\r\n"); // GSA OFF
-            _serial_gps->write("$PAIR062,3,0*3D\r\n"); // GSV OFF
-            _serial_gps->write("$PAIR062,4,1*3B\r\n"); // RMC ON
-            _serial_gps->write("$PAIR062,5,0*3B\r\n"); // VTG OFF
-            _serial_gps->write("$PAIR062,6,0*38\r\n"); // ZDA ON
+            // Configure NMEA sentences (all enabled)
+            _serial_gps->write("$PAIR062,0,1*3F\r\n"); // GGA
+            _serial_gps->write("$PAIR062,1,1*3E\r\n"); // GLL
+            _serial_gps->write("$PAIR062,2,1*3D\r\n"); // GSA
+            _serial_gps->write("$PAIR062,3,1*3C\r\n"); // GSV
+            _serial_gps->write("$PAIR062,4,1*3B\r\n"); // RMC
+            _serial_gps->write("$PAIR062,5,1*3A\r\n"); // VTG
+            _serial_gps->write("$PAIR062,6,1*39\r\n"); // ZDA
 
             delay(250);
             _serial_gps->write("$PAIR513*3D\r\n"); // save configuration
@@ -824,6 +825,9 @@ GPS::~GPS()
 // Put the GPS hardware into a specified state
 void GPS::setPowerState(GPSPowerState newState, uint32_t sleepTime)
 {
+    // Prevent GPS from ever sleeping
+    if (newState == GPS_SOFTSLEEP || newState == GPS_HARDSLEEP || newState == GPS_OFF)
+        return;
     // Update the stored GPSPowerstate, and create local copies
     GPSPowerState oldState = powerState;
     powerState = newState;
@@ -1860,6 +1864,7 @@ bool GPS::whileActive()
 #ifdef GPS_DEBUG
         debugmsg += vformat("%c", (c >= 32 && c <= 126) ? c : '.');
 #endif
+        Serial.write((uint8_t)c);
         isValid |= reader.encode(c);
         if (charsInBuf > sizeof(UBXscratch) - 10 || c == '\r') {
             if (strnstr((char *)UBXscratch, "$GPTXT,01,01,02,u-blox ag - www.u-blox.com*50", charsInBuf)) {

You can remove the prevent sleep and use the position update interval of 8 seconds to keep it on.