use bitstamp API with https, lower refresh rate

nebman · Sep 16, 2017 · 6f8d995 · 6f8d995
1 parent 5ff9733
commit 6f8d995
Showing 1 changed file with 33 additions and 18 deletions.
diff --git a/btc-ticker-esp8266.ino b/btc-ticker-esp8266.ino
@@ -12,18 +12,21 @@
 
 #include <LedControl.h>
 
-const String url = "http://api.coindesk.com/v1/bpi/currentprice.json";
+const char* fingerprint = "D0 26 AB 06 64 07 BC 88 56 6D 83 BE 0A 29 00 B5 10 E5 27 D2";
+const char* host = "www.bitstamp.net";
+const int   port = 443;
+const char* url = "/api/v2/ticker/btcusd/";
+WiFiClientSecure https;
 
 const int brightness_full = 8; // 0-15 normal brightness
 const int brightness_load = 8; // 0-15 while requesting data
 
+const int     refresh_time = 15000; // time to refresh, 15sec default
 unsigned long next_refresh = 0;
 
 LedControl lc = LedControl(D7, D8, D6, 1);
 WiFiManager wifiManager;
 
-HTTPClient http;
-
 void setup() {
   // start serial for debug output
   Serial.begin(115200);
@@ -77,24 +80,37 @@ void loop() {
 
   if( (long)(millis() - next_refresh) >= 0)
   {
+    unsigned int err = 0;
+
     setDashes();
     setBrightnessLoading(true);
 
     Serial.print("REQUEST ");
     Serial.println(url);
 
-    http.begin(url);
-    int code = http.GET();
-    Serial.println(code);
+    if (https.connect(host, port)) {
+      Serial.println("OK");
+    } else {
+      Serial.println("NOCONN");
+      err = 100;
+    }
+
+    https.print(String("GET ") + url + " HTTP/1.1\r\n" +
+               "Host: " + host + "\r\n" +
+               "User-Agent: ESP8266 7-Segment Ticker\r\n" +
+               "Connection: close\r\n\r\n");
+
+    while (https.connected()) {
+      String line = https.readStringUntil('\n');
+      if (line == "\r") break; // end of headers
+    }
 
-    if (code == 200) {
-      String payload = http.getString();
-
+    String line = https.readStringUntil('\n'); // one line of json    
+
+    if (line) { 
       DynamicJsonBuffer jsonBuffer(1100);
-      JsonObject& root = jsonBuffer.parseObject(payload);
-      JsonObject& bpi = root["bpi"];
-      JsonObject& bpi_USD = bpi["USD"];
-      int last = bpi_USD["rate_float"]; // last USD btc
+      JsonObject& root = jsonBuffer.parseObject(line);
+      int last = root["last"]; // last USD btc
 
       Serial.print("last = ");
       Serial.println(last);
@@ -111,13 +127,12 @@ void loop() {
       setBrightnessLoading(false);
     } else {
       lc.setChar (0, 3, 'E', true);
-      lc.setDigit(0, 2, (code%1000)/100, false);
-      lc.setDigit(0, 1, (code%100)/10, false);
-      lc.setDigit(0, 0, (code%10), false);
+      lc.setDigit(0, 2, (err%1000)/100, false);
+      lc.setDigit(0, 1, (err%100)/10, false);
+      lc.setDigit(0, 0, (err%10), false);
     }
 
-    http.end();
-    next_refresh = millis() + 30000;
+    next_refresh = millis() + refresh_time;
   }
 
 }