Add support for put values

src/Devices/EthernetServer_TC.cpp

@@ -6,6 +6,7 @@
 #include "Devices/Ethernet_TC.h"
 #include "Devices/JSONBuilder.h"
 #include "Devices/LiquidCrystal_TC.h"
+#include "Devices/PID_TC.h"
 #include "Serial_TC.h"
 #include "TankController.h"
 
@@ -94,6 +95,37 @@ void EthernetServer_TC::post() {
   }
 }
 
+// Handles an HTTP PUT request
+void EthernetServer_TC::put() {
+  enum { Kd, Ki, Kp } var;
+  if (memcmp_P(buffer + 4, F("/api/1/set?Kd="), 14) == 0) {
+    var = Kd;
+  } else if (memcmp_P(buffer + 4, F("/api/1/set?Ki="), 14) == 0) {
+    var = Ki;
+  } else if (memcmp_P(buffer + 4, F("/api/1/set?Kp="), 14) == 0) {
+    var = Kp;
+  } else {
+    serial(F("put \"%s\" not recognized!"), buffer + 5);
+    sendResponse(HTTP_BAD_REQUEST);
+    state = FINISHED;
+    return;
+  }
+  float value = strtofloat(buffer + 18);
+  switch (var) {
+    case Kd:
+      PID_TC::instance()->setKd(value);
+      break;
+    case Ki:
+      PID_TC::instance()->setKi(value);
+      break;
+    case Kp:
+      PID_TC::instance()->setKp(value);
+      break;
+  }
+  sendCurrentRedirect();
+  state = FINISHED;
+}
+
 /* API Handler
  * currently only version 1 is supported
  * Calls helper functions
@@ -167,7 +199,7 @@ void EthernetServer_TC::keypress() {
     if (key == '#' || key == '*' || (key >= '0' && key <= '9') || (key >= 'A' && key <= 'D')) {
       // States will handle keypresses appropriately
       TankController::instance()->setNextKey(key);
-      sendResponse(HTTP_REDIRECT);
+      sendDisplayRedirect();
     } else {
       serial(F("bad character: %c"), key);
       sendResponse(HTTP_BAD_REQUEST);
@@ -379,6 +411,9 @@ void EthernetServer_TC::loop() {
           } else if (memcmp_P(buffer, F("POST "), 5) == 0) {
             state = POST_REQUEST;
             post();
+          } else if (memcmp_P(buffer, F("PUT "), 4) == 0) {
+            state = PUT_REQUEST;
+            put();
           } else if (memcmp_P(buffer, F("OPTIONS "), 8) == 0) {
             state = OPTIONS_REQUEST;
             options();
@@ -435,12 +470,27 @@ void EthernetServer_TC::sendHeadersWithSize(uint32_t size) {
   client.write('\n');
 }
 
-void EthernetServer_TC::sendResponse(int code) {
+void EthernetServer_TC::sendCurrentRedirect() {
+  const __FlashStringHelper *response_303 =
+      F("HTTP/1.1 303 See Other\r\n"
+        "Location: /api/1/current\r\n"
+        "Access-Control-Allow-Origin: *\r\n"
+        "\r\n");
+  strscpy_P(buffer, response_303, sizeof(buffer));
+  client.write(buffer);
+}
+
+void EthernetServer_TC::sendDisplayRedirect() {
   const __FlashStringHelper *response_303 =
       F("HTTP/1.1 303 See Other\r\n"
         "Location: /api/1/display\r\n"
         "Access-Control-Allow-Origin: *\r\n"
         "\r\n");
+  strscpy_P(buffer, response_303, sizeof(buffer));
+  client.write(buffer);
+}
+
+void EthernetServer_TC::sendResponse(int code) {
   const __FlashStringHelper *response_400 =
       F("HTTP/1.1 400 Bad Request\r\n"
         "\r\n");
@@ -463,9 +513,6 @@ void EthernetServer_TC::sendResponse(int code) {
         "\r\n");
   char buffer[100];  // Space for longest of above responses
   switch (code) {
-    case HTTP_REDIRECT:
-      strscpy_P(buffer, response_303, sizeof(buffer));
-      break;
     case HTTP_BAD_REQUEST:
       strscpy_P(buffer, response_400, sizeof(buffer));
       break;

src/Devices/EthernetServer_TC.h

@@ -23,6 +23,7 @@ enum serverState_t {
   READ_REQUEST,
   GET_REQUEST,
   POST_REQUEST,
+  PUT_REQUEST,
   OPTIONS_REQUEST,
   COUNTING_FILES,
   LISTING_FILES,
@@ -69,10 +70,13 @@ class EthernetServer_TC : public EthernetServer {
   // instance methods: utility
   void sendHeadersWithSize(uint32_t size);
   void sendResponse(int);
+  void sendCurrentRedirect();
+  void sendDisplayRedirect();
   int weekday(int year, int month, int day);
   // instance methods: HTTP
   void get();
   void post();
+  void put();
   void options();
   void echo();
   void apiHandler();

src/TC_util.cpp

@@ -57,3 +57,18 @@ int floattostrf(double float_value, int min_width, int num_digits_after_decimal,
     return 2;
   }
 }
+
+float strtofloat(const char *buffer) {
+  float left = 0, right = 0;
+  int i, j = 1;
+  for (i = 0; isDigit(buffer[i]); ++i) {
+    left = left * 10 + buffer[i] - '0';
+  }
+  if (buffer[i] == '.') {
+    for (i = i + 1; isDigit(buffer[i]); ++i) {
+      right = right * 10 + buffer[i] - '0';
+      j = j * 10;
+    }
+  }
+  return left + right / j;
+}

src/TC_util.h

@@ -27,3 +27,4 @@ int strscpy(char *destination, const char *source, unsigned long sizeOfDestinati
 int strscpy_P(char *destination, const __FlashStringHelper *source, unsigned long sizeOfDestination);
 int floattostrf(double float_value, int min_width, int num_digits_after_decimal, char *buffer,
                 unsigned long buffer_size);
+float strtofloat(const char *buffer);