polaris/.drafts/.5/gps_conn_static/gps_conn_static.ino

// ===================================================================
// Auth: alex
// File: gps_conn_static.ino
// Revn: 08-08-2023  3.0
// Func: connect GPS module to Golang's net.Conn via ESP8266
//
// TODO: store data in EEPROM, retrieve it after power failure
// ===================================================================
// CHANGE LOG
// -------------------------------------------------------------------
//*07-20-2023: ac copied from gps_conn.ino
//                added switch/case 
// 07-25-2023: ac changed start/fin to ot/za
//                gutted client timeout block, already commented
//                added EEPROM.h
//                removed code block that closes client connection
// 07-27-2023: ac added spin loop to spin until location is updated
//                  (very broken)
//*08-01-2023: ac removed spin loop, added isUpdated() condition to
//                  client sending block
// 08-07-2023: ac rough bones for separating case 0 from case 1
//*08-08-2023: ac fleshed out the rough bones
//                moved smart delay and updated/valid prints out of 
//                  mode if/else blocks
//
// ===================================================================


#include <ESP8266WiFi.h>                  // Special Wifi Library
#include <TinyGPS++.h>                    // Tiny GPS Plus Library
// Software Serial Library so we can use other Pins for communication
// with the GPS module
#include <SoftwareSerial.h>
#include "EEPROM.h"


// wifi credentials
#ifndef STASSID
//#define STASSID "kaer fdsafdsafdsa"
#define STASSID "kaer morhen"
#define STAPSK "project:sentinel"
#endif


// set ESP Rx to GPIO 12 (connect to Ublox Tx),
// Tx to GPIO 13 (connect to Ublox Rx)
// GPIO pinout image at URL: https://m.media-amazon.com/images/I/812vnqUs5tL.jpg
// Should also have an image in git repository
// Ublox 6m GPS module to pins 12 and 13
static const int RXPin = 12, TXPin = 13;
// Ublox GPS default Baud Rate is 9600
static const uint32_t GPSBaud = 9600;

// wifi credentials
const char* ssid = STASSID;
const char* password = STAPSK;

const unsigned char host[4] = { 192, 168, 1, 120 };
//const char* host = "xyz.xyz.xyz.xyz";
const uint16_t port = 1202;

// literally keep track of how many messages have been sent
int count = 0;
int attempts = 0;     // keep track of connection attempts
bool mode = false;    // keep track of connection status

// Create an Instance of the TinyGPS++ object called gps
TinyGPSPlus gps;
// The serial connection to the GPS device
SoftwareSerial ss(RXPin, TXPin);

void setup() {
  // Set ESP and Software Serial comms speed
  Serial.begin(115200);
  ss.begin(GPSBaud);

  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  /* Explicitly set the ESP8266 to be a WiFi-client, otherwise, it by default,
     would try to act as both a client and an access-point and could cause
     network-issues with your other WiFi-devices on your WiFi-network. */
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  // wait for connection to be established
  while (WiFi.status() != WL_CONNECTED && attempts < 10) {
    delay(500);
    Serial.print(".");
    attempts++;
  }

  // keep track of whether connected or not
  mode = WiFi.status() != WL_CONNECTED;

  Serial.println("");
  if( mode ) {      // attempt to connect to wifi
    // print connection details
    Serial.println("WiFi NOT connected");
  } else {
    // print connection details
    Serial.println("WiFi connected");
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());
  }
}


void loop() {

  Serial.print( "isUpdated: " );
  Serial.println( gps.location.isUpdated() );
  Serial.print( "isValid: " );
  Serial.println( gps.location.isValid() );
  delay( 1000 * 30 );
  //     1000 milliseconds in one second
  //            30 seconds in one-half minute

  // XXX This is case 0, where the GPS does not connect to WiFi XXX
  if( mode ) {   // mode is true when WiFi is not connected
    // only send message if client is connected and location is valid
    if (gps.location.isValid()) {
      // This will only show gps info
      Serial.println("showing gps data");
      switch( count ) {
        case 0:     // on the first message
          Serial.println("start/ot");
          count++;
          break;
        case 15:    // on the last message
          Serial.println("fin/za");
          count = 0;    // restart count
          break;
        default:    // data messages
          // print data to serial monitor
          Serial.print(gps.location.lat(), 6);    // 6 decimals of precision
          Serial.print(",");
          Serial.println(gps.location.lng(), 6);
          count++;
          break;
      }
    }
  // XXX This is case 0, where the GPS connects to WiFi XXX
  } else {    // mode is false when WiFi is connected
    // print connecty things every loop
    // it disconnects every loop. Don't love this tbh
    Serial.print("connecting to ");
    //Serial.print(host);
    Serial.print(':');
    Serial.println(port);

    // Use WiFiClient class to create TCP connections
    WiFiClient client;
    if (!client.connect(host, port)) {
      Serial.println("connection failed");
      delay(5000);
      //return;
    }

    // only send message if client is connected and location is valid
    if (client.connected() && gps.location.isValid()) {
      // This will send and show gps info
      Serial.println("sending gps data");
      switch( count ) {
        case 0:     // on the first message
          // send start message
          client.println("ot");
          Serial.println("start/ot");
          count++;
          break;
        case 15:    // on the last message
          // send finale message
          client.println("za");
          Serial.println("fin/za");
          count = 0;    // restart count
          break;
        default:    // data messages
          // send data to server
          client.print(gps.location.lat(), 6);    // 6 decimals of precision
          client.print(",");
          client.println(gps.location.lng(), 6);
          // print data to serial monitor
          Serial.print(gps.location.lat(), 6);    // 6 decimals of precision
          Serial.print(",");
          Serial.println(gps.location.lng(), 6);
          count++;
          break;
      }
    }
  }

  smartDelay(500);          // Run Procedure smartDelay

  // if GPS is not connected correctly
  if (millis() > 5000 && gps.charsProcessed() < 10)
    Serial.println(F("No GPS data received: check wiring"));

}

// Custom version of delay() ensures gps object is being "fed"
static void smartDelay(unsigned long ms) {              
  unsigned long start = millis();
  do {    // wait until GPS has data
    while (ss.available())
      gps.encode(ss.read());
  } while (millis() - start < ms);
}