start mqtt client (based on paho.mqtt.c), basically works

3rd/paho.mqtt.c/fmt.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+#
+# Runs clang format over the whole project tree, excluding the 'build/' directory.
+#
+
+find . -type d \( -path './build' \) -prune -iname '*.h' -o -iname '*.c' | xargs clang-format -i
+