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;
int value = 0;
char dataTemplete[]="{\"shumtest\":%d}";
char msgJson;
char debug_buf;
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 == '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=char(0x03);
msg_buf=char(json_len>>8);
msg_buf=char(json_len&0xff);
memcpy(msg_buf+3,msgJson,strlen(msgJson));
msg_buf = 0;
client.publish("$dp",msg_buf,3+strlen(msgJson),false);
}
}</i>
这是所有的代码
如果是上传数据到onenet物联网平台，可以用这串代码
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