Re: MQTT Commander - an Android Application
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OK...
I am convinced there is an old WString wandering around on your machine
with missing __FlashStringHelper definition (bug dated March 31, 2015)
My final advice
Close Arduino IDE
delete all files and folders in your Arduino15 folder (just keep preferences.txt)
Arduino15 folders may be in "AppData\Roaming" _and/or_ "AppData\local"
Open Arduino 1.6.5 IDE, goto File/Preferences/Additional boards manager URL
Enter: http://arduino.esp8266.com/staging/pack ... index.json
Goto Menu/tools/board:"XXXXXXX"/Boards manager and download package 1.6.5-1106-g8253b82 (staging version)
Close IDE and re open
I am convinced there is an old WString wandering around on your machine
with missing __FlashStringHelper definition (bug dated March 31, 2015)
My final advice
Close Arduino IDE
delete all files and folders in your Arduino15 folder (just keep preferences.txt)
Arduino15 folders may be in "AppData\Roaming" _and/or_ "AppData\local"
Open Arduino 1.6.5 IDE, goto File/Preferences/Additional boards manager URL
Enter: http://arduino.esp8266.com/staging/pack ... index.json
Goto Menu/tools/board:"XXXXXXX"/Boards manager and download package 1.6.5-1106-g8253b82 (staging version)
Close IDE and re open