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我想从 SIM800L 模块向 firebase 发送 POST 请求。到目前为止，我只收到错误 603，它告诉我我没有访问权限？

当我从安装在笔记本电脑上的 Postman 发送相同的请求时，它工作正常，读写访问权限设置为 true。

我是否必须在请求中发送某种身份验证令牌或其他东西？

提前致谢

这是arduino控制SIM800L模块的代码

#define SIM800L_RX     27
#define SIM800L_TX     26
#define SIM800L_PWRKEY 4
#define SIM800L_RST    5
#define SIM800L_POWER  23

String apn = "internet.eplus.de";      //APN
String apn_u = "eplus";                //APN-Username
String apn_p = "gprs";                 //APN-Password
String url = "https://benchmark-7913c-default-rtdb.europe-west1.firebasedatabase.app/.json";  //URL of Server

void setup()
{
  pinMode(SIM800L_POWER, OUTPUT);
  digitalWrite(SIM800L_POWER, HIGH);

  Serial.begin(115200);
  Serial.println("ESP32+SIM800L AT CMD Test");
  Serial2.begin(9600, SERIAL_8N1, SIM800L_TX, SIM800L_RX);
  delay(15000);
  while (Serial2.available()) {
    Serial.write(Serial2.read());
  }
  delay(2000);
  gsm_config_gprs();

  gsm_http_post("{\"test\" : \"true\"}");
  Serial.println("Done");
}


void loop() {
  
}

void gsm_http_post( String postdata) {
  Serial.println(" --- Start GPRS & HTTP --- ");
  gsm_send_serial("AT+SAPBR=1,1");
  gsm_send_serial("AT+SAPBR=2,1");
  gsm_send_serial("AT+HTTPINIT");
  gsm_send_serial("AT+HTTPPARA=CID,1");
  gsm_send_serial("AT+HTTPPARA=\"URL\"," + url);
  gsm_send_serial("AT+HTTPPARA=CONTENT,application/x-www-form-urlencoded");
  gsm_send_serial("AT+HTTPDATA=192,5000");
  gsm_send_serial(postdata);
  gsm_send_serial("AT+HTTPACTION=1");
  gsm_send_serial("AT+HTTPREAD");
  gsm_send_serial("AT+HTTPTERM");
  gsm_send_serial("AT+SAPBR=0,1");
}

void gsm_config_gprs() {
  Serial.println(" --- CONFIG GPRS --- ");
  gsm_send_serial("AT+SAPBR=3,1,Contype,GPRS");
  gsm_send_serial("AT+SAPBR=3,1,APN," + apn);
  if (apn_u != "") {
    gsm_send_serial("AT+SAPBR=3,1,USER," + apn_u);
  }
  if (apn_p != "") {
    gsm_send_serial("AT+SAPBR=3,1,PWD," + apn_p);
  }
}

void gsm_send_serial(String command) {
  Serial.println("Send ->: " + command);
  Serial2.println(command);
  long wtimer = millis();
  while (wtimer + 3000 > millis()) {
    while (Serial2.available()) {
      Serial.write(Serial2.read());
    }
  }
  Serial.println();
}
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1 回答 1

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在分配数据库位置之前，您似乎要添加.json到 URL 的末尾。错误 603 仅表示您尝试访问的位置根本不存在。

示例网址：https://docs-examples.firebaseio.com/rest/saving-data/fireblog/posts.json

文档：https ://firebase.google.com/docs/database/rest/retrieve-data

于 2021-06-08T23:07:16.050 回答