truffle-config.js

 const HDWalletProvider = require('@truffle/hdwallet-provider');
 const fs = require('fs');
 const mnemonic = fs.readFileSync(".secret").toString().trim();

module.exports = {

  networks: {
     development: {
      host: "127.0.0.1",     // Localhost (default: none)
      port: 8545,            // Standard Ethereum port (default: none)
      network_id: "*",       // Any network (default: none)
     },
     bscTestnet: {
      provider: () => new HDWalletProvider(mnemonic, `https://data-seed-prebsc-2-s1.binance.org:8545`),
      network_id: 97,
      confirmations: 2,
      //timeoutBlocks: 200,
      skipDryRun: true,
    },
    bscMainnet: {
      provider: () => new HDWalletProvider(mnemonic, `https://bsc-dataseed1.binance.org`),
      network_id: 56,
      confirmations: 10,
      timeoutBlocks: 200,
      skipDryRun: true
    },
  },

  // Set default mocha options here, use special reporters, etc.
  mocha: {
    // timeout: 100000
  },

  // Configure your compilers
  compilers: {
    solc: {
      version: "^0.8.0",      // Fetch exact version from solc-bin (default: truffle's version)
    }
  },
};