Get the ESP8266 toolchain

In this section, we will just setup the workspace area, and download the toolchain from Espressif.
Note : The toolchain link provided here works fine. However, those tools will be updated in the future, so be sure to check for any updates

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• First, you need to install all dependencies

 $> sudo apt-get install gcc git wget curl make libncurses-dev flex bison gperf python

• Next create an appropriated folder, download the toolchain, and extract it

 $> mkdir -p ~/esp && cd ~/esp
 $> wget https://dl.espressif.com/dl/xtensa-lx106-elf-gcc8_4_0-esp-2020r3-linux-amd64.tar.gz
 $> tar -xzf xtensa-lx106-elf-*
 $> rm *.tar.gz

• Then, automate the sourcing of the toolchain path

 $> echo "export PATH=\"$PATH:$HOME/esp/xtensa-lx106-elf/bin\"" >> ~/.bashrc

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You need to close and reopen your terminal before changes take effect.