Add policy and inform service provider on address of MAM_DATA

device-client.js

/**
  * Process MAM message for added authorization.
  * @param message {Object} MAM message of type {@link AUTHORIZED_TYPE}.
  * @returns {undefined}
  */
processAuthorizedMessage(message) {
  const { serviceProvider } = message.policy;
  logger.info(`Authorizing service provider ${JSON.stringify(serviceProvider)}`);
  this.authorizedServiceProviders.add(serviceProvider);
  this.sendMamData(this.seed, serviceProvider.iotaAddress, serviceProvider.publicKeyTrytes);
}