How to decode server response

12king · September 14, 2022, 5:28pm

I am bit confused I send this request http://192.168.172.3:2001/detail?Id=1111 in postman and then I get following response from server in postman

json format

{
    "USER": "IDS",
	
    "Byte": {
        "public_id": 62,
        "communication": {
            "user_id": 24,
            "range": [
                {
                    "no_1": "111"
                },
                {
                    "no_2": "222"
                },
                {
                    "no_3": "333"
                }
            ]
        },
        "Internet": {
            "user_id": 115,
            "range": [
                {
                    "no_1": "144"
                },
                {
                    "card_1": "1.1"
                }
            ]
        }
    },
    "InternetData": [
        {
            "id_1": 1,
            "name_1": "rock",
            "wait_1": 1
        },
        {
            "id_2": 2,
            "name_2": "devid",
            "wait_2": 1
        },
        {
            "id_3": 3,
            "name_3": "dave",
            "wait_3": 5
        },
        {
            "id_4": 4,
            "name_4": "stev",
            "wait_4": 3
        }
    ]
}

request header

// send HTTP request header
client.println("GET" + " " + PATH_NAME +  String S("?Id=1111");" HTTP/1.1");
client.println("Host: " + String(HOST_NAME));
client.println("Connection: close");
client.println(); // end HTTP request header

I don't understand How to decode this type of server response ? Do I only need to
Deserialize ?

jfjlaros · September 14, 2022, 6:22pm

You may want to have a look at one of the JSON libraries. E.g.,

johnwasser · September 14, 2022, 7:42pm

Deserializing is a start. The ArduinoJson 'Assistant' will show you how.

// Stream& input;

StaticJsonDocument<768> doc;

DeserializationError error = deserializeJson(doc, input);

if (error) {
  Serial.print(F("deserializeJson() failed: "));
  Serial.println(error.f_str());
  return;
}

const char* USER = doc["USER"]; // "IDS"

JsonObject Byte = doc["Byte"];
int Byte_public_id = Byte["public_id"]; // 62

int Byte_communication_user_id = Byte["communication"]["user_id"]; // 24

JsonArray Byte_communication_range = Byte["communication"]["range"];

const char* Byte_communication_range_0_no_1 = Byte_communication_range[0]["no_1"]; // "111"

const char* Byte_communication_range_1_no_2 = Byte_communication_range[1]["no_2"]; // "222"

const char* Byte_communication_range_2_no_3 = Byte_communication_range[2]["no_3"]; // "333"

int Byte_Internet_user_id = Byte["Internet"]["user_id"]; // 115

const char* Byte_Internet_range_0_no_1 = Byte["Internet"]["range"][0]["no_1"]; // "144"

const char* Byte_Internet_range_1_card_1 = Byte["Internet"]["range"][1]["card_1"]; // "1.1"

JsonArray InternetData = doc["InternetData"];

JsonObject InternetData_0 = InternetData[0];
int InternetData_0_id_1 = InternetData_0["id_1"]; // 1
const char* InternetData_0_name_1 = InternetData_0["name_1"]; // "rock"
int InternetData_0_wait_1 = InternetData_0["wait_1"]; // 1

JsonObject InternetData_1 = InternetData[1];
int InternetData_1_id_2 = InternetData_1["id_2"]; // 2
const char* InternetData_1_name_2 = InternetData_1["name_2"]; // "devid"
int InternetData_1_wait_2 = InternetData_1["wait_2"]; // 1

JsonObject InternetData_2 = InternetData[2];
int InternetData_2_id_3 = InternetData_2["id_3"]; // 3
const char* InternetData_2_name_3 = InternetData_2["name_3"]; // "dave"
int InternetData_2_wait_3 = InternetData_2["wait_3"]; // 5

JsonObject InternetData_3 = InternetData[3];
int InternetData_3_id_4 = InternetData_3["id_4"]; // 4
const char* InternetData_3_name_4 = InternetData_3["name_4"]; // "stev"
int InternetData_3_wait_4 = InternetData_3["wait_4"]; // 3

lesept · September 14, 2022, 8:08pm

It's here
Select your options, then paste your response : 2 clicks after, you get the code. Just keep the info you're looking for.

12king · September 15, 2022, 12:48am

Do I need to add the code of Deserialization in this way ?

#include <SPI.h>
#include <Ethernet.h>
#include <ArduinoJson.h>

const char* USER;

JsonObject Byte;
int Byte_public_id;

int Byte_communication_user_id ;

JsonArray Byte_communication_range;

const char* Byte_communication_range_0_no_1;

const char* Byte_communication_range_1_no_2;
const char* Byte_communication_range_2_no_3;

int Byte_Internet_user_id;

const char* Byte_Internet_range_0_no_1;

const char* Byte_Internet_range_1_card_1;

JsonArray InternetData;
JsonObject InternetData_0 ;
int InternetData_0_id_1;
const char* InternetData_0_name_1;
int InternetData_0_wait_1;

JsonObject InternetData_1;
int InternetData_1_id_2 ;
const char* InternetData_1_name_2 ;
int InternetData_1_wait_2;

JsonObject InternetData_2;
int InternetData_2_id_3 ;
const char* InternetData_2_name_3;
int InternetData_2_wait_3;

JsonObject InternetData_3;
int InternetData_3_id_4;
const char* InternetData_3_name_4;
int InternetData_3_wait_4;
// replace the MAC address below by the MAC address printed on a sticker on the Arduino Shield 2
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

EthernetClient client;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:

  while (client.available())
  {
    // read an incoming byte from the server and print them to serial monitor:
    char c = client.read();
    Serial.print(c);

    // Stream& input;

    StaticJsonDocument<768> doc;

    DeserializationError error = deserializeJson(doc, client);

    if (error) {
      Serial.print(F("deserializeJson() failed: "));
      Serial.println(error.f_str());
      return;
    }
    USER = doc["USER"]; // "IDS"

    JsonObject Byte = doc["Byte"];
    Byte_public_id = Byte["public_id"]; // 62

    Byte_communication_user_id = Byte["communication"]["user_id"]; // 24

    JsonArray Byte_communication_range = Byte["communication"]["range"];

    Byte_communication_range_0_no_1 = Byte_communication_range[0]["no_1"]; // "111"

    Byte_communication_range_1_no_2 = Byte_communication_range[1]["no_2"]; // "222"

    Byte_communication_range_2_no_3 = Byte_communication_range[2]["no_3"]; // "333"

    Byte_Internet_user_id = Byte["Internet"]["user_id"]; // 115

    Byte_Internet_range_0_no_1 = Byte["Internet"]["range"][0]["no_1"]; // "144"

    Byte_Internet_range_1_card_1 = Byte["Internet"]["range"][1]["card_1"]; // "1.1"

    JsonArray InternetData = doc["InternetData"];

    JsonObject InternetData_0 = InternetData[0];
    int InternetData_0_id_1 = InternetData_0["id_1"]; // 1
    const char* InternetData_0_name_1 = InternetData_0["name_1"]; // "rock"
    int InternetData_0_wait_1 = InternetData_0["wait_1"]; // 1

    JsonObject InternetData_1 = InternetData[1];
    InternetData_1_id_2 = InternetData_1["id_2"]; // 2
    InternetData_1_name_2 = InternetData_1["name_2"]; // "devid"
    InternetData_1_wait_2 = InternetData_1["wait_2"]; // 1

    JsonObject InternetData_2 = InternetData[2];
    InternetData_2_id_3 = InternetData_2["id_3"]; // 3
    InternetData_2_name_3 = InternetData_2["name_3"]; // "dave"
    InternetData_2_wait_3 = InternetData_2["wait_3"]; // 5

    JsonObject InternetData_3 = InternetData[3];
    InternetData_3_id_4 = InternetData_3["id_4"]; // 4
    InternetData_3_name_4 = InternetData_3["name_4"]; // "stev"
    InternetData_3_wait_4 = InternetData_3["wait_4"]; // 3



  }

}

12king · September 15, 2022, 6:13am

why Byte_communication_range_0_no_1 variable printing 0 instead 111

#include <SPI.h>
#include <Ethernet.h>
#include <ArduinoJson.h>

const char* USER;

JsonObject Byte;
int Byte_public_id;

int Byte_communication_user_id ;

JsonArray Byte_communication_range;

const char* Byte_communication_range_0_no_1;

const char* Byte_communication_range_1_no_2;
const char* Byte_communication_range_2_no_3;

int Byte_Internet_user_id;

const char* Byte_Internet_range_0_no_1;

const char* Byte_Internet_range_1_card_1;

JsonArray InternetData;
JsonObject InternetData_0 ;
int InternetData_0_id_1;
const char* InternetData_0_name_1;
int InternetData_0_wait_1;

JsonObject InternetData_1;
int InternetData_1_id_2 ;
const char* InternetData_1_name_2 ;
int InternetData_1_wait_2;

JsonObject InternetData_2;
int InternetData_2_id_3 ;
const char* InternetData_2_name_3;
int InternetData_2_wait_3;

JsonObject InternetData_3;
int InternetData_3_id_4;
const char* InternetData_3_name_4;
int InternetData_3_wait_4;
// replace the MAC address below by the MAC address printed on a sticker on the Arduino Shield 2
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

EthernetClient client;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:

  while (client.available())
  {
    // read an incoming byte from the server and print them to serial monitor:
    char c = client.read();
    Serial.print(c);

    // Stream& input;

    StaticJsonDocument<768> doc;

    DeserializationError error = deserializeJson(doc, client);

    if (error) {
      Serial.print(F("deserializeJson() failed: "));
      Serial.println(error.f_str());
      return;
    }
    USER = doc["USER"]; // "IDS"

    JsonObject Byte = doc["Byte"];
    Byte_public_id = Byte["public_id"]; // 62

    Byte_communication_user_id = Byte["communication"]["user_id"]; // 24

    JsonArray Byte_communication_range = Byte["communication"]["range"];

    Byte_communication_range_0_no_1 = Byte_communication_range[0]["no_1"]; // "111"
    Serial.println(Byte_communication_range_0_no_1);
  }

}

12king · September 17, 2022, 1:19pm

What does it means ?

18:40:33.215 -> connected
18:40:33.308 -> HdeserializeJson() failed: InvalidInput
18:40:33.400 -> 1deserializeJson() failed: InvalidInput
18:40:33.447 -> 2deserializeJson() failed: InvalidInput
18:40:33.447 -> OdeserializeJson() failed: InvalidInput
18:40:33.540 -> 
18:40:33.540 -> deserializeJson() failed: InvalidInput
18:40:33.540 ->  deserializeJson() failed: InvalidInput
18:40:33.587 ->  deserializeJson() failed: InvalidInput
18:40:33.634 -> SdeserializeJson() failed: InvalidInput
18:40:33.680 -> 2deserializeJson() failed: InvalidInput
18:40:33.726 -> 1deserializeJson() failed: InvalidInput
18:40:33.773 -> 1deserializeJson() failed: InvalidInput
18:40:33.819 -> 5deserializeJson() failed: InvalidInput
18:40:33.866 -> GdeserializeJson() failed: InvalidInput
18:40:33.912 ->

johnwasser · September 17, 2022, 1:33pm

Looks like what you are passing to deserialize() is not a valid JSON document. If you send the characters you read from ‘client’ to Serial Monitor, does it look like a JSON document?

12king · September 17, 2022, 2:07pm

Does the error here show that the deserialization has not been successful?

I am attaching two test's result of serial monitor
test 1

18:40:33.215 -> connected
18:40:33.308 -> HdeserializeJson() failed: InvalidInput
18:40:33.400 -> 1deserializeJson() failed: InvalidInput
18:40:33.447 -> 2deserializeJson() failed: InvalidInput
18:40:33.447 -> OdeserializeJson() failed: InvalidInput
18:40:33.540 -> 
18:40:33.540 -> deserializeJson() failed: InvalidInput
18:40:33.540 ->  deserializeJson() failed: InvalidInput
18:40:33.587 ->  deserializeJson() failed: InvalidInput
18:40:33.634 -> SdeserializeJson() failed: InvalidInput
18:40:33.680 -> 2deserializeJson() failed: InvalidInput
18:40:33.726 -> 1deserializeJson() failed: InvalidInput
18:40:33.773 -> 1deserializeJson() failed: InvalidInput
18:40:33.819 -> 5deserializeJson() failed: InvalidInput
18:40:33.866 -> GdeserializeJson() failed: InvalidInput
18:40:33.912 -> 
18:40:33.912 -> deserializeJson() failed: InvalidInput
18:40:33.912 ->  deserializeJson() failed: InvalidInput
18:40:34.004 -> 
18:40:34.004 -> deserializeJson() failed: InvalidInput
18:40:34.050 ->  deserializeJson() failed: InvalidInput
18:40:34.050 -> 
18:40:34.050 -> deserializeJson() failed: InvalidInput
18:40:34.144 ->  deserializeJson() failed: InvalidInput
18:40:34.144 -> jdeserializeJson() failed: InvalidInput
18:40:34.190 -> 
18:40:34.237 -> true 
18:40:34.237 -> 2
18:40:34.237 -> name

Test2



18:41:31.264 -> connected
18:41:31.358 -> HdeserializeJson() failed: InvalidInput
18:41:31.403 -> 1deserializeJson() failed: InvalidInput
18:41:31.449 -> 2deserializeJson() failed: InvalidInput
18:41:31.449 -> OdeserializeJson() failed: InvalidInput
18:41:31.542 -> 
18:41:31.542 -> deserializeJson() failed: InvalidInput
18:41:31.587 ->  deserializeJson() failed: InvalidInput
18:41:31.587 ->  deserializeJson() failed: InvalidInput
18:41:31.634 -> SdeserializeJson() failed: InvalidInput
18:41:31.681 -> 2deserializeJson() failed: InvalidInput
18:41:31.728 -> 1deserializeJson() failed: InvalidInput
18:41:31.774 -> 1deserializeJson() failed: InvalidInput
18:41:31.820 -> 4deserializeJson() failed: InvalidInput
18:41:31.866 -> GdeserializeJson() failed: InvalidInput
18:41:31.912 -> 
18:41:31.912 -> deserializeJson() failed: InvalidInput
18:41:31.959 ->  deserializeJson() failed: InvalidInput
18:41:32.005 -> 
18:41:32.005 -> deserializeJson() failed: InvalidInput
18:41:32.052 ->  deserializeJson() failed: InvalidInput
18:41:32.052 -> 
18:41:32.052 -> deserializeJson() failed: InvalidInput
18:41:32.145 ->  deserializeJson() failed: InvalidInput
18:41:32.191 -> jdeserializeJson() failed: InvalidInput
18:41:32.191 -> 
18:41:32.238 -> true
18:41:32.238 -> 2
18:41:32.238 -> name

johnwasser · September 17, 2022, 2:20pm

Yes. It says “failed: Invalid Input”.

12king · September 17, 2022, 2:28pm

I am getting confused because I am getting the value along with the error message

18:41:32.238 -> true
18:41:32.238 -> 2
18:41:32.238 -> name

what message should be displayed after deserialization?

johnwasser · September 17, 2022, 2:39pm

It looks like you are calling deserialize twenty times with invalid JSON before you call it with valid JSON.

system · March 16, 2023, 4:16pm

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How to decode server response

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