update mqttd program, fix rpi build bug for strcasestr()

Guo Wenxue

2019-06-26 74d93589a9de6c6c5158f122a2f73f6877a6317f

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BIN_FILES=tcp_server udp_server
 
all: clean ${BIN_FILES}
 
tcp_server:
    gcc $@.c  -o $@
    
udp_server:
    gcc $@.c  -o $@
 
clean:
    @rm -f ${BIN_FILES}