new file: main/include/functions.h

modified:   main/include/sht31.h
renamed:    main/include/lib.h -> main/src/functions.c
modified:   main/src/http_client.c
modified:   main/src/main.c
modified:   main/src/sht31.c

firmware/main/src/functions.c

@@ -0,0 +1,119 @@
+#include "functions.h"
+#include "freertos/FreeRTOS.h"
+
+static const char * TAG = "functions.c";
+
+void split_float(float num, int *int_part, float *dec_part) {
+    // Extract the integer part
+    *int_part = (float)((int)num);
+    
+    // Calculate the fractional part by subtracting the integer part from the original number
+    *dec_part = num - *int_part;
+}
+
+// Helper function to reverse a string
+static void reverse(char* str, int len) {
+    int i = 0, j = len - 1;
+    while (i < j) {
+        char temp = str[i];
+        str[i] = str[j];
+        str[j] = temp;
+        i++;
+        j--;
+    }
+}
+
+// Helper function to convert an integer to a string
+static int intToStr(int x, char str[], int d) {
+    int i = 0;
+    while (x) {
+        str[i++] = (x % 10) + '0';
+        x = x / 10;
+    }
+
+    // If the number of digits required is more, then add 0s at the beginning
+    while (i < d)
+        str[i++] = '0';
+
+    reverse(str, i);
+    str[i] = '\0';
+    return i;
+}
+
+char* floatToString(float num) {
+    // Allocate memory for the string
+    char* str = (char*)malloc(50 * sizeof(char));
+    if (str == NULL) {
+        // If memory allocation fails, return NULL
+        return NULL;
+    }
+
+    // Handle integer part
+    int intPart = (int)num;
+    int i = intToStr(intPart, str, 0);
+
+    // Handle fractional part
+    float fractionalPart = num - (float)intPart;
+    if (fractionalPart < 0) {
+        fractionalPart = -fractionalPart;
+    }
+
+    if (fractionalPart != 0) {
+        str[i++] = '.'; // Add decimal point
+
+        // Consider precision up to 6 digits after the decimal point
+        for (int j = 0; j < 6; j++) {
+            fractionalPart = fractionalPart * 10;
+            int fracIntPart = (int)fractionalPart;
+            str[i++] = fracIntPart + '0';
+            fractionalPart = fractionalPart - fracIntPart;
+        }
+    }
+
+    str[i] = '\0'; // Null-terminate the string
+
+    return str;
+}
+
+// Function to convert an integer to a string
+char* intToString(int num)
+{
+    // Allocate memory for the string
+    char* str = (char*)malloc(50 * sizeof(char));
+
+    int i = 0;
+    // Save the sign of the number
+    int sign = num;
+
+    // If the number is negative, make it positive
+    if (num < 0) {
+        num = -num;
+    }
+
+    // Extract digits from the number and add them to the
+    // string
+    do {
+        // Convert integer digit to character
+        str[i++] = num % 10 + '0';
+    } while ((num /= 10) > 0);
+
+    // If the number was negative, add a minus sign to the
+    // string
+    if (sign < 0) {
+        str[i++] = '-';
+    }
+
+    // Null-terminate the string
+    str[i] = '\0';
+
+    // Reverse the string to get the correct order
+    for (int j = 0, k = i - 1; j < k; j++, k--) {
+        char temp = str[j];
+        str[j] = str[k];
+        str[k] = temp;
+    }
+
+    return str;
+}
+
+