Wrapper to attach MAM message to Tangle

iota-mam.js

/**
 * Attach an MAM message.
 * @function attach
 * @param {JSON} packet JSON packet to attach.
 * @returns {Promise} Containing the root or error
 */
async attach(packet) {
  this.logger.info(`Attaching packet ${util.inspect(packet)} to the Tangle`);

  const trytes = iota.api.toTrytes(JSON.stringify(packet));
  const { state, payload, root, address } = MAM.create(
    this.mamState
    trytes,
  );
  this.mamState = state;

  try {
    await MAM.attach(payload, address, this.iotaDepth, this.iotaMinWeightMagnitude);
    this.logger.info(`Successfully attached to Tangle at address ${address} and root ${root}.`);
    return root;
  } catch (err) {
    this.logger.error(err);
    throw err;
  }
}