update mqttd for auto fill-in light and test ok

guowenxue

2019-07-31 8a0e43e2ba062b35f20ddcd83a7811a9e1a71786

tools/rpi_crosstool.tar.bz2 does not exist in tree d68cc36845a892c1e2d95c6d8792a8fa613f8eae