Fix ESP8266 Adafruit IO Secure Example

ESP8266 BSP 2.5.1's WiFiClientSecure switched to BearSSL as the default (https://github.com/esp8266/Arduino/blob/2.5.1/libraries/ESP8266WiFi/src/WiFiClientSecure.h#L27).

• adafruitio_secure_esp8266.ino example fixed in #156

Adding AirLift Example

Adding an example sketch for connecting any board which uses an AirLift ESP32 Co-Processor to Adafruit IO using Adafruit MQTT.

This example works both AirLift all-in-one boards (such as the PyPortal) and external airlift peripherals (such as the AirLift ESP32 Breakout)

Release Notes

• Added AirLift MQTTs Example
• Removed PyPortal-only example

WiFiNiNa and SAMD51 Support

• Adding SAMD51 Support
  • PyPortal example w/WiFiNiNa library, https://github.com/adafruit/Adafruit_MQTT_Library/blob/master/examples/adafruitio_secure_pyportal/adafruitio_secure_pyportal.ino
• Checking message type in readSubscription, thanks @ACE1046: #147

0.20.4

• Update Adafruit IO SSL Fingerprint in the Adafruit IO Secure ESP8266 example (https://github.com/adafruit/Adafruit_MQTT_Library/blob/master/examples/adafruitio_secure_esp8266/adafruitio_secure_esp8266.ino)
• Bump library version

0.20.3

Release Notes:

• Do you need to subscribe to more MQTT feeds? The maximum number of active MQTT subscriptions has been increased to 15.
  • If you're using an Arduino Uno or a 328p/32u4-based hardware platform, the maximum number of subscriptions is 5.

0.20.2

Release Notes

Library

• Cleaned up compiler warnings.
• Added handling for reading zero-length packets

Travis

• Travis is working again on this repository for all pull requests and branch builds!
  • Travis updated to support current Adafruit IO hardware platform targets: ESP8266, SAMD
  • Replace outdated libraries (WINC, CC3000) installation with Arduino's WiFi101 library.

Examples

• Patched fingerprint compile error in adafruitio_secure_esp8266.ino.

Fix for Winc1500 example to use WiFi101

0.20.1

bump fix for winc1500

Fix for ESP8266 and possibly other compilers!

0.20.0

typo

v0.17.0

adds generic io callback support

v0.16.2

add platform #ifdef for subscription length