web3 code generator can't connect to account address to call method of contract

The automatically generated code of Web3 cannot possibly send a transaction, since it doesn’t provide a caller address or a private key. So, it just calls a method with no one to pay for the gas. So, connection to RPC is not established.

result: {
  call: [Function: bound _executeMethod] {
    request: [Function: bound _executeMethod]
  },
  send: [Function: bound _executeMethod] {
    request: [Function: bound _executeMethod]
  },
  encodeABI: [Function: bound _encodeMethodABI],
  estimateGas: [Function: bound _executeMethod],
  createAccessList: [Function: bound _executeMethod],
  arguments: [],
  _method: {
    type: 'function',
    name: 'greet',
    stateMutability: 'view',
    inputs: [],
    outputs: [ [Object] ],
    constant: true,
    payable: undefined,
    signature: '0xcfae3217'
  },
  _parent: Contract {
    setProvider: [Function (anonymous)],
    currentProvider: [Getter/Setter],
    _requestManager: RequestManager {
      provider: [HttpProvider],
      providers: [Object],
      subscriptions: Map(0) {}
    },
    givenProvider: null,
    providers: {
      WebsocketProvider: [Function: WebsocketProvider],
      HttpProvider: [Function: HttpProvider],
      IpcProvider: [Function: IpcProvider]
    },
    _provider: HttpProvider {
      withCredentials: false,
      timeout: 0,
      headers: undefined,
      agent: undefined,
      connected: false,
      host: 'https://rpc-mumbai.maticvigil.com/',
      httpsAgent: [Agent]
    },
    setRequestManager: [Function (anonymous)],
    BatchRequest: [Function: bound Batch],
    extend: [Function: ex] {
      formatters: [Object],
      utils: [Object],
      Method: [Function: Method]
    },
    clearSubscriptions: [Function (anonymous)],
    options: { address: [Getter/Setter], jsonInterface: [Getter/Setter] },
    handleRevert: [Getter/Setter],
    defaultCommon: [Getter/Setter],
    defaultHardfork: [Getter/Setter],
    defaultChain: [Getter/Setter],
    transactionPollingTimeout: [Getter/Setter],
    transactionPollingInterval: [Getter/Setter],
    transactionConfirmationBlocks: [Getter/Setter],
    transactionBlockTimeout: [Getter/Setter],
    blockHeaderTimeout: [Getter/Setter],
    defaultAccount: [Getter/Setter],
    defaultBlock: [Getter/Setter],
    methods: {
      greet: [Function: bound _createTxObject],
      '0xcfae3217': [Function: bound _createTxObject],
      'greet()': [Function: bound _createTxObject]
    },
    events: { allEvents: [Function: bound ] },
    _address: '0x43a35f6D0AEA7bdcD07E12aA4769353241ef1433',
    _jsonInterface: [ [Object] ]
  },
  _ethAccounts: <ref *1> Accounts {
    currentProvider: [Getter/Setter],
    _requestManager: RequestManager {
      provider: [HttpProvider],
      providers: [Object],
      subscriptions: Map(0) {}
    },
    givenProvider: null,
    providers: {
      WebsocketProvider: [Function: WebsocketProvider],
      HttpProvider: [Function: HttpProvider],
      IpcProvider: [Function: IpcProvider]
    },
    _provider: HttpProvider {
      withCredentials: false,
      timeout: 0,
      headers: undefined,
      agent: undefined,
      connected: false,
      host: 'https://rpc-mumbai.maticvigil.com/',
      httpsAgent: [Agent]
    },
    setProvider: [Function (anonymous)],
    setRequestManager: [Function (anonymous)],
    _ethereumCall: {
      getNetworkId: [Function],
      getChainId: [Function],
      getGasPrice: [Function],
      getTransactionCount: [Function],
      getBlockByNumber: [Function]
    },
    wallet: Wallet {
      _accounts: [Circular *1],
      length: 0,
      defaultKeyName: 'web3js_wallet'
    }
  }
}