update udp server example code

guowenxue

2 days ago 175027cd66b49a1bc21ad2070cd4e1abc45b030a

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#!/bin/bash
 
hostname="weike-iot.com"
port=8013
uid="lingyun"
pwd="lingyun"
 
options="-h $hostname -p $port -u $uid -P $pwd"
 
topic="\$Sys/Studio/Uplink"
 
set -x
mosquitto_sub $options -t $topic