kopanitsa / web3-arduino Goto Github PK

Is it only compatible with the main network or can I also work with rinkeby? i have already read that it is difficult to access rinkeby with the standard web3 package.

Hi, Trying to make a simple call using example code:

Web3.cpp:19:36: error: no matching function for call to 'BearSSL::WiFiClientSecure::setCACert(const char*&)'
client.setCACert(infura_ca_cert);

Hello,
I can interact with Ethereum network using this library but I can't interact with smart contracts as I receive the error "insufficient funds for gas * price + value". However, the account that I use has enough ether. The problem is related to the private key, I think I am not accessing to my account. May you help me.

I am setting my private key as a string and I got it using Metamask. In provided example, the form of the private key is as follow:
const char PRIVATE_KEY[] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
How can I get this form.

Hi,

I am trying to get access to infura, however I get the following error:

Starting connection to server...
Connected to server!
HTTP/1.1 403 Forbidden
Date: Tue, 15 Dec 2020 13:48:18 GMT
Content-Type: application/json
Content-Length: 163
Connection: close
Vary: Origin
{"jsonrpc":"2.0","id":0,"error":{"code":-32600,"message":"project ID is required","data":{"reason":"project ID not provided","see":"https://infura.io/dashboard"}}}

This is my code:

#include <WiFi.h>
#include <Web3.h>

#define ENV_SSID "***"
#define ENV_WIFI_KEY ""

string* INFURA_HOST = new string("mainnet.infura.io");
string* INFURA_PATH = new string("/PROECT_ID");
Web3 web3(INFURA_HOST, INFURA_PATH);

void web3_example();

void setup() {
Serial.begin(115200);
for(uint8_t t = 4; t > 0; t--) {
Serial.printf("[SETUP] WAIT %d...\n", t);
Serial.flush();
delay(1000);
}

WiFi.begin(ENV_SSID, ENV_WIFI_KEY);

// attempt to connect to Wifi network:
while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    // wait 1 second for re-trying
    delay(1000);
}

Serial.println("Connected to WiFi");

net_example();

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

void web3_example() {
string result = web3.Web3ClientVersion();
Serial.println("web3_ClientVersion");
Serial.println(result.c_str());
}

Hello,

first of all thanks for sharing, this is a great project especially since there are not many with web3 for arduino out there!
Unfortunately I'm getting compiler errors I can't fix even through changing gcc versions:

`...appdata\local\arduino15\packages\arduino\tools\arm-none-eabi-gcc\4.8.3-2014q1\arm-none-eabi\include\c++\4.8.3\bits\stl_algobase.h:239:56: error: macro "min" passed 3 arguments, but takes just 2

 min(const _Tp& __a, const _Tp& __b, _Compare __comp)`

and
`...appdata\local\arduino15\packages\arduino\tools\arm-none-eabi-gcc\4.8.3-2014q1\arm-none-eabi\include\c++\4.8.3\bits\stl_algobase.h:260:56: error: macro "max" passed 3 arguments, but takes just 2

 max(const _Tp& __a, const _Tp& __b, _Compare __comp)`

Does someone have an idea how to fix this? I have tried different fixesI found (like using std::min), but none of them works.

Thanks a lot,
jna380

Hello, I ma trying to communicate my NODEMCU ESP32 to Ethereum network through infura. However, I got an error when starting connection to server. The image below show the error:

this is my code:
`#include <WiFi.h>
#include <Web3.h>
#define ENV_SSID "dlink"
#define ENV_WIFI_KEY ""
#define INFURA_HOST "mainnet.infura.io"
#define INFURA_PATH "ee31c1d4946c4dbb89debb7d4af08cf3"

Web3 web3((string*)INFURA_HOST, (string*)INFURA_PATH);

void setup() {
Serial.begin(115200);
for(uint8_t t = 4; t > 0; t--) {
Serial.printf("[SETUP] WAIT %d...\n", t);
Serial.flush();
delay(1000);
}
WiFi.begin(ENV_SSID, ENV_WIFI_KEY);
// attempt to connect to Wifi network:
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
// wait 1 second for re-trying
delay(1000);
}
Serial.println("Connected");
string result = web3.Web3ClientVersion();
}

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

Hello,

I am trying to send a transaction on an Infura Ropsten node.
The transaction is executed, but the value is empty.

The code is:

// transaction
    string contract_address = "0xc4edaebde3a6fc825a2f3eadae69e5db93e6e967";
    Contract contract(&web3, &contract_address);
    contract.SetPrivateKey(privateKey);
    string address = "0x3d355bcdF4d712861E7Dad907Ca1F3509F511A88";
    uint32_t nonceVal = (uint32_t)web3.EthGetTransactionCount(&address);

    uint32_t gasPriceVal = 141006540;
    uint32_t  gasLimitVal = 3000000;
    string toStr = "0xc4edaebde3a6fc825a2f3eadae69e5db93e6e967";
    string valueStr = "0x00";

    string func = "set(uint256)";
    string p = contract.SetupContractData(&func, 123);
    string result = contract.SendTransaction(nonceVal, gasPriceVal, gasLimitVal, &toStr, &valueStr, &p);

The result is:
https://ropsten.etherscan.io/tx/0x1fddb5d20e587f349af7175d4bdb9e55db174fe3373a4f84201446b5ae018937

How can I send 123 to the smart contract ?

Thanks,

Hi there. Whenever I try to make calls to contract, Infura returns -1. I'm running Eth_call.ino. But no other examples seems to work either

while data encoding works fine for uint, it fails for uint256

The correct functionality is already there. It does just not trigger. Ill come up with a fix for this...

Hi everyone

Im a bit nooby in Arduino programming. Just wanted to ask if this library is still working. I have my esp32 libraries downloaded but I receive some errors as
"fatal error: ../Conf.h: No such file or directory
#include "../Conf.h"

Do I need to download some additional library or the library is just not working anymore?

the value of the private key changes after forcing it to uint8_t.
In the provided example, the private key is declared as follow:
const char PRIVATE_KEY[] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
in my case, I set it as follow:
const char PRIVATE_KEY[] = "0x.........";

In the provided example, the private key is forced to (uint8_t*). After forcing the private key, the value of the private key will be changed.

Hello.

I am interested in getting this library up and running for my nodemcu. I however fall short pretty much immediately. When I use the example code I get an error code at:

Web3 web3(INFURA_HOST, INFURA_PATH);

and my defines are:

#define INFURA_HOST "rinkeby.infura.io"
#define INFURA_PATH "/mypath"

Where of course the path is really my infura path.

The error is:

SMART-:14:35: error: no matching function for call to 'Web3::Web3(const char [18], const char [36])'
 Web3 web3(INFURA_HOST, INFURA_PATH);
                                   ^

/Users/project.ino:14:35: note: candidates are:
In file included from /Users/project.ino:3:0:
/Users/mypath/Documents/Arduino/libraries/web3-arduino-master/src/Web3.h:15:5: note: Web3::Web3(const string*, const string*)
     Web3(const string* _host, const string* _path);

It feels weird since I've copy pasted the example code from the repo.

Would you please provide a code sample showing how to initiate a transaction on the Goeli testnet, where a function is called in a smart contract and parameters can also be passed to the function call, preferably as int8?

The RLP specification has one path for encoding 0-55 bytes and another path for encoding longer byte arrays.

This should be programmed as if length < 56 or if length <= 55. There are two places with length < 55

I cannot connect to the Infura node.

I use the following URL: https://goerli.infura.io/v3/My_ID

Does the library support https at all?

Can this library be used with local blockchain RPC or other private/remote blockchains?

Hi,
I'm sorry i'm out of context.i'm new to this web3, i understand this is for esp32 but i want to use it with MKR GSM 1400.

I don't find any source for this. I'll be happy if anyone will help me on this.

There is a wrong length calculation in the RlpEncodeWholeHeaderWithVector method:

consider this payload:
"0xa9059cbb00000000000000000000000081aed945a46f8542d72cd207b1a2d2934eda71b50000000000000000000000000000000000000000000000000000065dd0837000"

This should give
b8 44 a9 05 9c bb 00 00 00 00 00 00 00 00 00 00 00 00 81 ae d9 45 a4 6f 85 42 d7 2c d2 07 b1 a2 d2 93 4e da 71 b5 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 06 5d d0 83 70 00

but currently returns
b9 44 a9 05 9c bb 00 00 00 00 00 00 00 00 00 00 00 00 81 ae d9 45 a4 6f 85 42 d7 2c d2 07 b1 a2 d2 93 4e da 71 b5 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 06 5d d0 83 70 00

with everything correct except the first byte b9 where it should be b8

Hi,

I'm wondering if it's possible to use this library to listen to events triggered by the smart contract.

https://github.com/ethereum/wiki/wiki/JavaScript-API#contract-events

I could not find it in the examples.

Thanks,

Tim

I zipped the cloned repository and include it from Arduino IDE. When I tried to include library on Arduino IDE and tried some example to verify the code. It does not compile with the error below:

In file included from /home/narya/Arduino/libraries/web3-arduino/examples/eth_call/eth_call.ino:2:0:
/home/narya/Arduino/libraries/web3-arduino/src/Web3.h:11:18: fatal error: string: No such file or directory
 #include <string>
                  ^
compilation terminated.
exit status 1
Error compiling for board Arduino/Genuino Uno.

I have downloaded STL library from the following link but another problem exists. http://andybrown.me.uk/downloads/
I also included it here but I do not think that library is ready-to-use when downloaded.

/home/narya/Arduino/libraries/web3-arduino/src/Util.cpp:7:18: fatal error: cstdio: No such file or directory #include <cstdio> ^ compilation terminated. exit status 1