update iotd, test MQTT subscriber ok

guowenxue

2021-04-21 af30c84d820576c37e57de31bc47d18b6e4b89e1

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INST_PATH=/usr/bin
 
BIN_FILES=dns
 
all: clean 
    gcc *.c -o ${BIN_FILES}
 
 
clean: 
    rm -f ${BIN_FILES}
 
install: 
    @cp ${BIN_FILES} ${INST_PATH}