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Solidity version is 0.5.1 the buyTokens function works fine when i call it directly from myetherwallet or remix, but it does not work when i send some ether to address. I think it doesn't even call the fallback function.

the buyTokens function is an public payable function

function () external payable {
        buyTokens(msg.sender);
    }
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  • Fallback functions cannot do that, the gas spent in a function is limited to a very small gas amount
    – Majd TL
    Apr 20 at 20:19
  • You can use function buytoken() external payable without the fallback function
    – Majd TL
    Apr 20 at 20:20
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A fallback function is invoked when the contract receives some Ether(or a non existent function is called) but the gas provided is only enough so as to emit a event if called using transfer or send . You can use call and specify the amount of gas if you want to execute any function inside the fallback. You can refer to this link https://solidity-by-example.org/sending-ether/

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