transfer get stuck

[MetaiR]

hi, when I use this library to download or upload files on some devices it got stuck at some random point and nothing happen, no error or retry or anything, it just got stuck, what can cause it?

my code:

         download() {
                client.get(path, (e, stream) => {
                      if (e) {
                          console.log('ftp face error for downloading id: ' + someId);
                          this.emitDownloadEvent(this.getDownloadProgressObj(someOtherId, someId, 0, 'ERROR', err));
                          reject();
                          return;
                      }
                      this.emitDownloadCalculatedPercentage(stream, someOtherId, someId, bytes);

                      FileUtil.createDirIfNotExists(videoStorage);

                      const output = fs.createWriteStream(savingPath);
                      stream.pipe(output);

                      output.on('close', () => {
                          console.log('ftp completed for downloading id: ' + someId);
                          this.emitDownloadEvent(this.getDownloadProgressObj(someOtherId, someId, 100, 'COMPLETED'));
                          client.end();
                          resolve();
                      });
                  });
         }

        private getDownloadProgressObj(someOtherId: number, someId: string, progress = 0, status: 'CONNECTED' | 'DOWNLOADING' | 'COMPLETED' | 'ERROR' = 'CONNECTED', ex?: Error): FtpProgress {
        return {
            someOtherId: someOtherId,
            type: 'DOWNLOAD',
            someId: someId,
            progress: progress,
            status: status,
            ex: ex
        };
    }

       private emitDownloadCalculatedPercentage(file: NodeJS.ReadableStream, someOtherId: number, someId: string, size: number) {
        let cur = 0;
        file.on('data', (d) => {
            cur += d.length;
            const percent = ((cur / size) * 100).toFixed(1);
            this.emitDownloadEvent(this.getDownloadProgressObj(someOtherId, someId, Number(percent), 'DOWNLOADING'));
        });
    }

    private emitDownloadEvent(progress: FtpProgress) {
        console.log(progress);
        FtpUtil.transferEvent.emit('download', progress);
    }