printing console.log into debug message (HEX Code Written to Buffer)

Question

I'm tinkering w/ zwack (https://github.com/paixaop/zwack) and trying to see what(HEX) are being written to the buffer in an effort to try to simulate a FTMS machine/server

The code

onReadRequest(offset, callback) {
    debugFTMS('[SupportedPowerRangeCharacteristic] onReadRequest');
    let buffer = new Buffer.alloc(6);
    let at = 0;

    let minimumPower = 0;
    buffer.writeInt16LE(minimumPower, at);
    at += 2;

    let maximumPower = 1000;
    buffer.writeInt16LE(maximumPower, at);
    at += 2;

    let minimumIncrement = 1;
    buffer.writeUInt16LE(minimumIncrement, at);
    at += 2;

    debugFTMS('[SupportedPowerRangeCharacteristic] onReadRequest:' + buffer);
    console.log(buffer);

    callback(this.RESULT_SUCCESS, buffer);
  }

the console.log(buffer) command outputs

<Buffer 00 00 e8 03 01 00>

I would like to roll this up into the debug messages instead. Specifically into this line

debugFTMS('[SupportedPowerRangeCharacteristic] onReadRequest:' + buffer);

but the result I'm getting is some unprintable characters

ftms [SupportedPowerRangeCharacteristic] onReadRequest:� +0ms

snak · Accepted Answer · 2021-07-07 14:48:44Z

1

You can use util.inspect to format a buffer that way.

const util = require('util');
...
debugFTMS('[SupportedPowerRangeCharacteristic] onReadRequest:' + util.inspect(buffer));

answered Jul 7, 2021 at 14:48

snak

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