Connected Devices & Network Interactions

Spent some time building out the REST API / Client (Arduino) Server (JavaScript/Node.js) relationship I'm going to have to build for this project but came across a few hurdles. I built off of Tom's boilerplate to develop my client side. I got the following output, which I know has successfully connected to my Wi-Fi and is outputting data from my temperature sensor:

Full Code:

#include <SPI.h>
#include <WiFiNINA.h>         // for MKR1010 modules
#include <ArduinoHttpClient.h>
#include <Arduino_JSON.h>
#include "DFRobot_SHT20.h"
#include "arduino_secrets.h"

DFRobot_SHT20    sht20;
byte mac[6];                    // mac address of your device
WiFiSSLClient netSocket;        // network socket to server
const char server[] = SECRET_SERVER;  // server name
String route = "data";         // API route

// the HTTP client is global so you can use it in multiple functions below:
HttpClient client(netSocket, server, 443);
// a JSON variable for the body of your requests:
JSONVar body;

// request timestamp in ms:
long lastRequest = 0;
// interval between requests:
int interval = 10000;

void setup() {
 Serial.begin(9600);              // initialize serial communication  
sht20.initSHT20();                                  // Init SHT20 Sensor
  delay(100);
  sht20.checkSHT20();                                 // Check SHT20 Sensor  

// while you're not connected to a WiFi AP, attempt to connect:
 while ( WiFi.status() != WL_CONNECTED) {
   Serial.print("Attempting to connect to Network named: ");
   Serial.println(SECRET_SSID);           // print the network name (SSID)
   WiFi.begin(SECRET_SSID, SECRET_PASS);  // try to connect
   delay(2000);
 }
‍
 // get your MAC address:
 WiFi.macAddress(mac);

// When you're connected, print out the device's network status:
 IPAddress ip = WiFi.localIP();
 Serial.print("IP Address: ");
 Serial.println(ip);
 Serial.print("MAC Address: ");
 Serial.println(macToString(mac));  

// add the mac address and session key to the body,
 // since they won't change:
 body["macAddress"] = macToString(mac);
 body["sessionKey"] = SECRET_SESSIONKEY;
}

void loop() {
 if (millis() - lastRequest > interval ) {    

// this is your data. It's a JSON object that will go
   // in the other JSON object (the body):
   JSONVar sensorData;    

// read sensor (in this case, a SHT20 temperature sensor):
   temperature = sht20.readTemperature();
   sensorData["temperature"] = temperature;    

// use this for POST:
   postData(JSON.stringify(sensorData));
‍
   //  or use this for GET:
//      getData();
   int transactionID = 539;
   //  or use this to GET one datum:
   //  getDatum(transactionID);
   //  or use this to DELETE one datum:
   //deleteDatum(transactionID);    

// read the status code and body of the response
   int statusCode = client.responseStatusCode();
   String response = client.responseBody();    

// print out the response:
   Serial.print("Status code: ");
   Serial.println(statusCode);
   Serial.print("Response: " );
   Serial.println(response);
   // when there's nothing left to the response,
   client.stop();           // close the request
   // timestamp the time of request:
   lastRequest = millis();
 }
}

void postData(String newData) {
 // set the content type and fill in the POST data:
 String contentType = "application/json";
 // the template for the body of the POST request:
 body["data"] = newData;
 Serial.println(body);
 // make the request
 client.post(route, contentType, JSON.stringify(body));
}

void getData() {
 // set the content type and fill in the body:
 String contentType = "application/json";  

// make the request:
 client.beginRequest();
 client.get(route);
 client.sendHeader("Content-Type", "application/json");
 client.sendHeader("Content-Length", body.length());
 client.beginBody();
 client.println(body);
 client.endRequest();
}

void getDatum(int newData) {
 // set the content type and fill in the body:
 String contentType = "application/json";
 // add the query to the route:
 String request = route + "/";
 request += String(newData);
 // make the request:
 client.beginRequest();
 client.get(request);
 client.sendHeader("Content-Type", "application/json");
 client.sendHeader("Content-Length", body.length());
 client.beginBody();
 client.print(body);
 client.endRequest();
}

void deleteDatum(int newData) {
 // set the content type and fill in the body:
 String contentType = "application/json";
 // the template for the body of the POST request:
 String body = " {\"macAddress\":\"MAC\",\"sessionKey\":\"KEY\"}";
 // replace the template placeholders with actual values:
 body.replace("MAC", macToString(mac));
 body.replace("KEY", SECRET_SESSIONKEY);  

// add the query to the route:
 String request = route + "/";
 request += String(newData);
 // make the request:
 client.beginRequest();
 client.del(request);
 client.sendHeader("Content-Type", "application/json");
 client.sendHeader("Content-Length", body.length());
 client.beginBody();
 client.print(body);
 client.endRequest();
}

// convert the MAC address to a String:
String macToString(byte mac[]) {
 String result;
 for (int i = 5; i >= 0; i--) {
   if (mac[i] < 16) {
     result += "0";
   }
   result += String(mac[i], HEX);
   if (i > 0)  result += ":";
 }
 return result;
}

I tried to then run a simple Node.js server on Glitch and called for the appropriate /Data route on a GET request but couldn't get anything in the log. Hoping to debug this week during office hours. I still think I have some work to do on the server side of things. I've also never built a server in this context before.

I got to go visit the farm in Sunset Park this week, which was fun. I was also gifted all of the basic materials for building my own bioreactor, which I now have running at home.