Started rest server

RestServer/calculate.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h> /* link against math lib */
+#include "calculate.h"
+
+#define R 8314.3 //J/(kmol*K) (universelle Gaskonstante)
+#define mw 18.016 //kg/kmol (Molekulargewicht des Wasserdampfes)
+
+/*
+Bezeichnungen:
+r = relative Luftfeuchte
+T = Temperatur in °C
+TK = Temperatur in Kelvin (TK = T + 273.15)
+TD = Taupunkttemperatur in °C
+DD = Dampfdruck in hPa
+SDD = Sättigungsdampfdruck in hPa
+
+Parameter:
+a = 7.5, b = 237.3 für T >= 0
+a = 7.6, b = 240.7 für T < 0 über Wasser (Taupunkt)
+a = 9.5, b = 265.5 für T < 0 über Eis (Frostpunkt)
+
+R* = 8314.3 J/(kmol*K) (universelle Gaskonstante)
+mw = 18.016 kg/kmol (Molekulargewicht des Wasserdampfes)
+AF = absolute Feuchte in g Wasserdampf pro m3 Luft
+
+Formeln:
+
+    SDD(T) = 6.1078 * 10^((a*T)/(b+T))
+    DD(r,T) = r/100 * SDD(T)
+    r(T,TD) = 100 * SDD(TD) / SDD(T)
+    TD(r,T) = b*v/(a-v) mit v(r,T) = log10(DD(r,T)/6.1078)
+    AF(r,TK) = 10^5 * mw/R* * DD(r,T)/TK; AF(TD,TK) = 10^5 * mw/R* * SDD(TD)/TK
+*/
+
+static float sdd(float temperature) {
+  //select constant based on input temperature
+  float a = 7.5, b = 237.3;
+  if (temperature >= 0) {
+    a = 7.6;
+    b = 240.7;
+  }
+  return 6.1078 * pow(10, (a * temperature) / (b + temperature));
+}
+
+static float dd(float relativeHumidity, float temperature) {
+  return relativeHumidity / 100 * sdd(temperature);
+}
+
+/* CURRENTLY UNUSED
+
+static float r(float temperature, float dewTemperature) {
+  // This is optional. Necessary with dew point measurements.
+  return 100 * sdd(dewTemperature) / sdd(temperature);
+}
+
+static float v(float relativeHumidity, float temperature) {
+  log10(dd(relativeHumidity, temperature)/6.1078);
+}
+
+static float td(float relativeHumidity, float temperature) {
+  //select constant based on input temperature
+  float a = 7.5, b = 237.3;
+  if (temperature >= 0) {
+    a = 7.6;
+    b = 240.7;
+  }
+  return b * v(relativeHumidity, temperature) / (a - v(relativeHumidity, temperature));
+}
+*/
+static float af(float relativeHumidity, float temperature) {
+    float tk = temperature + 273.15;
+    return pow(10, 5) * mw/R * dd(relativeHumidity, temperature) / tk;
+}
+
+float absoluteHumidity(sensor *sensor) {
+    return af(sensor->humidity, sensor->temperature);
+}
+
+float absoluteHumidityFloat(float temperature, float humidity) {
+    return af(humidity, temperature);
+}
+
+int compareSensors(sensor *inside, sensor *outside) {
+        //returns 1 if window should be opened
+	if (absoluteHumidity(inside) <= absoluteHumidity(outside)) return 1;
+	return 0;
+}
+  

RestServer/calculate.h

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+#ifndef calculate_H
+#define calculate_H
+
+#include "dht22.h"
+
+float absoluteHumidity(sensor *sensor);
+float absoluteHumidityFloat(float temperature, float humidity);
+int compareSensors(sensor *inside, sensor *outside);
+
+#endif

RestServer/main.c

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+ 

RestServer/makefile

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+#Infos: http://www.ijon.de/comp/tutorials/makefile.html
+
+
+VERSION = 1.0
+CC      = cc
+CFLAGS  = -Wall -g -D_GNU_SOURCE -D_REENTRANT -DVERSION=\"$(VERSION)\" `mysql_config --cflags`
+#LDFLAGS = -lm -lpthread `gtk-config --cflags` `gtk-config --libs` -lgthread
+LDFLAGS = -lwiringPi -lconfig `mysql_config --libs` -lcurl -lm
+
+OBJ = main.o dht22.o sendmysql.o configreader.o cJSON.o restcurl.o calculate.o
+
+dht22: $(OBJ)
+	$(CC) $(CFLAGS) -o humiditypi $(OBJ) $(LDFLAGS)
+        
+%.o: %.c
+	$(CC) $(CFLAGS) -c $<
+
+.PHONY: clean
+clean:
+	rm -r *.o
+
+install:
+	sudo cp humiditypi /usr/bin
+	if [ ! -d /etc/humiditypi ]; then sudo mkdir /etc/humiditypi; fi
+	sudo cp settings.cfg /etc/humiditypi
+
+uninstall:
+	sudo rm /usr/bin/humiditypi
+	rm -r /etc/humiditypi

RestServer/sendmysql.c

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+ /* Simple C program that connects to MySQL Database server*/
+#include <mysql/mysql.h>
+//#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include "calculate.h"
+#include "sendmysql.h"
+
+void insertData(sensor *s) {
+   MYSQL *conn;
+   //MYSQL_RES *res;
+   //MYSQL_ROW row;
+
+   char *server = "localhost";
+   char *user = "dhtuser";
+   char *password = "raspberry"; /* set me first */
+   char *database = "dhtstats";
+
+   conn = mysql_init(NULL);
+
+   /* Connect to database */
+   if (!mysql_real_connect(conn, server,
+         user, password, database, 0, NULL, 0)) {
+      fprintf(stderr, "%s\n", mysql_error(conn));
+      exit(1);
+   }
+    
+    /*
+   // send SQL query 
+   if (mysql_query(conn, "show tables")) {
+      fprintf(stderr, "%s\n", mysql_error(conn));
+      exit(1);
+   }
+
+   res = mysql_use_result(conn);
+
+   // output table name 
+   printf("MySQL Tables in mysql database:\n");
+   while ((row = mysql_fetch_row(res)) != NULL)
+      printf("%s \n", row[0]);
+    */
+   
+    char *pquerystring = NULL;
+
+    if (-1 == asprintf(&pquerystring, 
+    "INSERT INTO stats (node_id, pin, humidity, temperature, isoutside, gm3) VALUES (%i, %i, %f, %f, %i, %f)", s->node_id, s->pin, s->humidity, s->temperature, s->isoutside, absoluteHumidity(s))) {
+        perror("asprintf() failed");
+    } else {
+        if (mysql_query(conn, pquerystring)) {
+            fprintf(stderr, "%s\n", mysql_error(conn));
+            free(pquerystring);
+            exit(1);
+        }
+    }
+
+    free(pquerystring);
+    pquerystring = NULL;
+    
+   /* close connection */
+   //mysql_free_result(res);
+   mysql_close(conn);
+}
+
+
+
+
+
+
+void insertDataAverages(float temperature, float humidity, float gm3, int isoutside) {
+   MYSQL *conn;
+   //MYSQL_RES *res;
+   //MYSQL_ROW row;
+
+   char *server = "localhost";
+   char *user = "dhtuser";
+   char *password = "raspberry"; /* set me first */
+   char *database = "dhtstats";
+
+   conn = mysql_init(NULL);
+
+   /* Connect to database */
+   if (!mysql_real_connect(conn, server,
+         user, password, database, 0, NULL, 0)) {
+      fprintf(stderr, "%s\n", mysql_error(conn));
+      exit(1);
+   }
+    
+    /*
+   // send SQL query 
+   if (mysql_query(conn, "show tables")) {
+      fprintf(stderr, "%s\n", mysql_error(conn));
+      exit(1);
+   }
+
+   res = mysql_use_result(conn);
+
+   // output table name 
+   printf("MySQL Tables in mysql database:\n");
+   while ((row = mysql_fetch_row(res)) != NULL)
+      printf("%s \n", row[0]);
+    */
+   
+    char *pquerystring = NULL;
+    if (-1 == asprintf(&pquerystring, 
+    "INSERT INTO average_stats (humidity, temperature, gm3, isoutside) VALUES (%f, %f, %f, %i)", humidity, temperature, absoluteHumidityFloat(temperature, humidity), isoutside)) {
+        perror("asprintf() failed");
+    } else {
+        if (mysql_query(conn, pquerystring)) {
+            fprintf(stderr, "%s\n", mysql_error(conn));
+            free(pquerystring);
+            exit(1);
+        }
+    }
+
+    free(pquerystring);
+    pquerystring = NULL;
+    
+   /* close connection */
+   //mysql_free_result(res);
+   mysql_close(conn);
+}

RestServer/sendmysql.h

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+#include "dht22.h"
+
+void insertData(sensor *s); 
+void insertDataAverages(float temperature, float humidity, float gm3, int isoutside);