Revert ESP-MQTT (#508)

* Revert ESP-MQTT

* Revert ESP-MQTT

* Update sdkconfig.defaults

lib/espMqttClient/platformio.ini

@@ -0,0 +1,43 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+;[platformio]
+;default_envs = esp8266
+
+[common]
+build_flags =
+  -D DEBUG_ESP_MQTT_CLIENT=1
+  -D CORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_VERBOSE
+  -Wall
+  -Wextra
+  -std=c++11
+  -pthread
+  -ggdb3
+
+[env:native]
+platform = native
+test_build_src = yes
+build_flags =
+  ${common.build_flags}
+  -lgcov
+  --coverage
+  -D EMC_RX_BUFFER_SIZE=100
+  -D EMC_TX_BUFFER_SIZE=10
+  -D EMC_MULTIPLE_CALLBACKS=1
+  -D EMC_USE_MEMPOOL=1
+;extra_scripts = test-coverage.py
+build_type = debug
+test_testing_command =
+  valgrind
+  --leak-check=full
+  --show-leak-kinds=all
+  --track-origins=yes
+  --error-exitcode=1
+  ${platformio.build_dir}/${this.__env__}/program