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libraries/Adafruit_IO_Arduino/examples/adafruitio_17_time_subscribe/adafruitio_17_time_subscribe.ino

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+// Adafruit IO Time Topic Subscription Example
+//
+// Adafruit invests time and resources providing this open source code.
+// Please support Adafruit and open source hardware by purchasing
+// products from Adafruit!
+//
+// Written by Adam Bachman, Brent Rubell for Adafruit Industries
+// Copyright (c) 2018 Adafruit Industries
+// Licensed under the MIT license.
+//
+// All text above must be included in any redistribution.
+
+/************************** Configuration ***********************************/
+
+// edit the config.h tab and enter your Adafruit IO credentials
+// and any additional configuration needed for WiFi, cellular,
+// or ethernet clients.
+#include "config.h"
+
+/************************ Example Starts Here *******************************/
+
+// set up the 'time/seconds' topic
+AdafruitIO_Time *seconds = io.time(AIO_TIME_SECONDS);
+
+// set up the 'time/milliseconds' topic
+AdafruitIO_Time *msecs = io.time(AIO_TIME_MILLIS);
+
+// set up the 'time/ISO-8601' topic
+AdafruitIO_Time *iso = io.time(AIO_TIME_ISO);
+
+void setup() {
+
+  // start the serial connection
+  Serial.begin(115200);
+
+  // wait for serial monitor to open
+  while(! Serial);
+
+  Serial.print("Connecting to Adafruit IO");
+
+  // start MQTT connection to io.adafruit.com
+  io.connect();
+
+  // attach message handler for the seconds feed
+  seconds->onMessage(handleSecs);
+
+  // attach a message handler for the msecs feed
+  msecs->onMessage(handleMillis);
+
+  // attach a message handler for the ISO feed
+  iso->onMessage(handleISO);
+
+  // 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);
+  }
+
+  // we are connected
+  Serial.println();
+  Serial.println(io.statusText());
+
+}
+
+void loop() {
+
+  // io.run(); is required for all sketches.
+  // it should always be present at the top of your loop
+  // function. it keeps the client connected to
+  // io.adafruit.com, and processes any incoming data.
+  io.run();
+
+  // Because this sketch isn't publishing, we don't need
+  // a delay() in the main program loop.
+
+}
+
+
+// message handler for the seconds feed
+void handleSecs(char *data, uint16_t len) {
+  Serial.print("Seconds Feed: ");
+  Serial.println(data);
+}
+
+
+// message handler for the milliseconds feed
+void handleMillis(char *data, uint16_t len) {
+  Serial.print("Millis Feed: ");
+  Serial.println(data);
+}
+
+
+// message handler for the ISO-8601 feed
+void handleISO(char *data, uint16_t len) {
+  Serial.print("ISO Feed: ");
+  Serial.println(data);
+}

libraries/Adafruit_IO_Arduino/examples/adafruitio_17_time_subscribe/config.h

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+/************************ Adafruit IO Config *******************************/
+
+// visit io.adafruit.com if you need to create an account,
+// or if you need your Adafruit IO key.
+#define IO_USERNAME "your_username"
+#define IO_KEY "your_key"
+
+/******************************* WIFI **************************************/
+
+// the AdafruitIO_WiFi client will work with the following boards:
+//   - HUZZAH ESP8266 Breakout -> https://www.adafruit.com/products/2471
+//   - Feather HUZZAH ESP8266 -> https://www.adafruit.com/products/2821
+//   - Feather HUZZAH ESP32 -> https://www.adafruit.com/product/3405
+//   - Feather M0 WiFi -> https://www.adafruit.com/products/3010
+//   - Feather WICED -> https://www.adafruit.com/products/3056
+//   - Adafruit PyPortal -> https://www.adafruit.com/product/4116
+//   - Adafruit Metro M4 Express AirLift Lite ->
+//   https://www.adafruit.com/product/4000
+//   - Adafruit AirLift Breakout -> https://www.adafruit.com/product/4201
+//   - Adafruit AirLift Shield -> https://www.adafruit.com/product/4285
+//   - Adafruit AirLift FeatherWing -> https://www.adafruit.com/product/4264
+
+#define WIFI_SSID "your_ssid"
+#define WIFI_PASS "your_pass"
+
+// uncomment the following line if you are using airlift
+// #define USE_AIRLIFT
+
+// uncomment the following line if you are using winc1500
+// #define USE_WINC1500
+
+// uncomment the following line if you are using mrk1010 or nano 33 iot
+//#define ARDUINO_SAMD_MKR1010
+
+// comment out the following lines if you are using fona or ethernet
+#include "AdafruitIO_WiFi.h"
+
+#if defined(USE_AIRLIFT) || defined(ADAFRUIT_METRO_M4_AIRLIFT_LITE) ||         \
+    defined(ADAFRUIT_PYPORTAL)
+// Configure the pins used for the ESP32 connection
+#if !defined(SPIWIFI_SS) // if the wifi definition isnt in the board variant
+// Don't change the names of these #define's! they match the variant ones
+#define SPIWIFI SPI
+#define SPIWIFI_SS 10 // Chip select pin
+#define NINA_ACK 9    // a.k.a BUSY or READY pin
+#define NINA_RESETN 6 // Reset pin
+#define NINA_GPIO0 -1 // Not connected
+#endif
+AdafruitIO_WiFi io(IO_USERNAME, IO_KEY, WIFI_SSID, WIFI_PASS, SPIWIFI_SS,
+                   NINA_ACK, NINA_RESETN, NINA_GPIO0, &SPIWIFI);
+#else
+AdafruitIO_WiFi io(IO_USERNAME, IO_KEY, WIFI_SSID, WIFI_PASS);
+#endif
+/******************************* FONA **************************************/
+
+// the AdafruitIO_FONA client will work with the following boards:
+//   - Feather 32u4 FONA -> https://www.adafruit.com/product/3027
+
+// uncomment the following two lines for 32u4 FONA,
+// and comment out the AdafruitIO_WiFi client in the WIFI section
+// #include "AdafruitIO_FONA.h"
+// AdafruitIO_FONA io(IO_USERNAME, IO_KEY);
+
+/**************************** ETHERNET ************************************/
+
+// the AdafruitIO_Ethernet client will work with the following boards:
+//   - Ethernet FeatherWing -> https://www.adafruit.com/products/3201
+
+// uncomment the following two lines for ethernet,
+// and comment out the AdafruitIO_WiFi client in the WIFI section
+// #include "AdafruitIO_Ethernet.h"
+// AdafruitIO_Ethernet io(IO_USERNAME, IO_KEY);