Merge pull request #18 from adafruit/feed-last-value

Add Feed last value HTTP method and more accurate Data CSV parsing

Author: abachman

.gitignore

@@ -1,3 +1,12 @@
 *.swo
 *.swp
 .DS_Store
+.sync
+.syntastic_cpp_config
+
+# platformio (testing)
+.pioenvs
+.piolibdeps
+.travis.yml
+platformio.ini
+

README.md

@@ -14,6 +14,12 @@ This library requires the latest version of the [Arduino IDE](https://www.arduin
 * Latest version of the [Adafruit MQTT Library](https://github.com/adafruit/Adafruit_MQTT_Library)
 * Latest version of the [Arduino HTTP Client Library](https://github.com/arduino-libraries/ArduinoHttpClient)
 
+### Adafruit Feather HUZZAH32 (ESP32)
+
+* Latest version of the [ESP32 Arduino Core](https://github.com/espressif/arduino-esp32#using-through-arduino-ide)
+* Latest version of the [Adafruit MQTT Library](https://github.com/adafruit/Adafruit_MQTT_Library)
+* Latest version of the [Arduino HTTP Client Library](https://github.com/arduino-libraries/ArduinoHttpClient)
+
 ### Adafruit Feather M0 WiFi with ATWINC1500
 
 * Latest version of the [Arduino SAMD Arduino Core](https://github.com/arduino/ArduinoCore-samd)

examples/adafruitio_01_subscribe/adafruitio_01_subscribe.ino

@@ -32,7 +32,15 @@ void setup() {
 
   Serial.print("Connecting to Adafruit IO");
 
-  // connect to io.adafruit.com
+  // because Adafruit IO doesn't support the MQTT
+  // retain flag right now, we need to load the
+  // last value for the "counter" feed manually and
+  // send it our handleMessage function
+  if (counter->exists()) {
+    handleMessage(counter->lastValue());
+  }
+
+  // start MQTT connection to io.adafruit.com
   io.connect();
 
   // set up a message handler for the count feed.
@@ -41,8 +49,11 @@ void setup() {
   // received from adafruit io.
   counter->onMessage(handleMessage);
 
-  // wait for a connection
-  while(io.status() < AIO_CONNECTED) {
+  // wait for an MQTT connection
+  // NOTE: when blending the HTTP and MQTT API, always use the mqttStatus
+  // method to check on MQTT connection status specifically
+
+  while(io.mqttStatus() < AIO_CONNECTED) {
     Serial.print(".");
     delay(500);
   }

library.properties

@@ -1,5 +1,5 @@
 name=Adafruit IO Arduino
-version=2.7.0
+version=2.7.1
 author=Adafruit
 maintainer=Adafruit <info@adafruit.com>
 sentence=Arduino library to access Adafruit IO.

src/AdafruitIO.cpp

@@ -29,15 +29,17 @@ AdafruitIO::AdafruitIO(const char *user, const char *key)
 
 void errorCallback(char *err, uint16_t len)
 {
-  AIO_ERR_PRINTLN();
-  AIO_ERR_PRINT("ERROR: ");
-  AIO_ERR_PRINTLN(err);
-  AIO_ERR_PRINTLN();
+  AIO_ERROR_PRINTLN();
+  AIO_ERROR_PRINT("ERROR: ");
+  AIO_ERROR_PRINTLN(err);
+  AIO_ERROR_PRINTLN();
 }
 
 void AdafruitIO::connect()
 {
 
+  AIO_DEBUG_PRINTLN("AdafruitIO::connect()");
+
   if(_err_sub) {
     // setup error sub
     _err_sub = new Adafruit_MQTT_Subscribe(_mqtt, _err_topic);
@@ -221,7 +223,11 @@ aio_status_t AdafruitIO::mqttStatus()
   // if the connection failed,
   // return so we don't hammer IO
   if(_status == AIO_CONNECT_FAILED)
+  {
+    AIO_ERROR_PRINT("mqttStatus() failed to connect");
+    AIO_ERROR_PRINTLN(_mqtt->connectErrorString(_status));
     return _status;
+  }
 
   if(_mqtt->connected())
     return AIO_CONNECTED;

src/AdafruitIO.h

@@ -30,6 +30,7 @@
   #error "This sketch requires Adafruit MQTT Library v0.17.0 or higher. Please install or upgrade using the Library Manager."
 #endif
 
+
 class AdafruitIO {
 
   friend class AdafruitIO_Feed;