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By TheTwim
#37961 I have acheved exactly the same goal. An Arduino Uno board sending MQTT messages over the internet using and ESP-01 module as a wifi shield.
You first have to build the ESP WiFi Shield.
Then you can use the EspWiFi library.
Assuming you have an ESP-01 module with a recent firmware (1.1 or later) you don't need to flash any custom firmware.