求大佬看看，帮帮孩子，invalid conversion from 'const char*'to uint...

#include <WiFi.h>
#include <PubSubClient.h>
#include <ArduinoJson.h>
#define PIN_AO 34
int BUILTIN_LED = 12;
const char ssid[] = "wang";
const char password[] = "wanggnaw";
const char mqtt_server[] = "183.230.40.39";
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg_buf[200];
int value = 0;
char dataTemplete[]="{"shumtest":%d}";
char msgJson[75];
char debug_buf[200];
int i;
unsigned short json_len=0;
uint8_t* packet_p;
uint8_t debug_buffer_start_index = 0;
void setup_wifi() {
 delay(10);
 Serial.println();
 Serial.print("Connecting to ");
 Serial.println(ssid);
 WiFi.begin(ssid, password);
 while (WiFi.status() != WL_CONNECTED) {
 delay(500);
 Serial.print(".");
 }
 randomSeed(micros());
 Serial.println("");
 Serial.println("WiFi connected");
 Serial.println("IP address: ");
 Serial.println(WiFi.localIP());
}
void callback(char* topic, byte* payload, unsigned int length) {
 Serial.print("Message arrived [");
 Serial.print(topic);
 Serial.print("] ");
 for (int i = 0; i < length; i++) {
 Serial.print((char)payload<i>);
 }
 Serial.println();
 if ((char)payload[0] == '1') { // 收到字节为 1
 digitalWrite(BUILTIN_LED, HIGH); // 将继电器引脚电平拉高
 //delay(1000);
 // digitalWrite(BUILTIN_LED, LOW); // 将继电器引脚电平拉低
} else {
 // digitalWrite(BUILTIN_LED, HIGH); // 将继电器引脚电平拉高
 // delay(1000);
 digitalWrite(BUILTIN_LED, LOW); // 将继电器引脚电平拉低
 } }
void reconnect() {
 // Loop until we're reconnected
 while (!client.connected()) {
 Serial.print("Attempting MQTT connection...");
 if (client.connect("736391491","441729","w")) { 
 Serial.println("connected");
 client.publish("outTopic", "hello world");
 client.subscribe("inTopic");
 } else {
 Serial.print("failed, rc=");
 Serial.print(client.state());
 Serial.println(" try again in 5 seconds");
 delay(5000);
   }
  } 
 }
void setup() {
 pinMode(BUILTIN_LED, OUTPUT);
 pinMode(PIN_AO, INPUT);
 Serial.begin(115200);
 setup_wifi();
 client.setServer(mqtt_server, 6002);
 client.connect("736391491","441729","w");
 client.setCallback(callback);
}
void loop() {
 if (!client.connected()) {
 reconnect();
 }
 client.loop();
 int shum = analogRead(PIN_AO); 
 Serial.println(shum); 
 delay(500);

 long now = millis();

 if (now - lastMsg > 2000){
 lastMsg = now;


 ++value;
 snprintf(msgJson,40,dataTemplete,shum);
 json_len=strlen(msgJson);
 msg_buf[0]=char(0x03); 
 msg_buf[1]=char(json_len>>8);
 msg_buf[2]=char(json_len&0xff); 
 memcpy(msg_buf+3,msgJson,strlen(msgJson));
 msg_buf[3+strlen(msgJson)] = 0;
 client.publish("$dp",msg_buf,3+strlen(msgJson),false);
 } 
}</i>
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如果是上传数据到onenet物联网平台，可以用这串代码