xmodem

[exile]

Xmodem

In order to upgrade XBee programmable modules over the air with node.js based tooling there is need for an Xmodem protocol implementation.

Project home: https://github.com/exsilium/xmodem.js

Protocol sequence for uploading

• Sender == uploader
• Receiver == downloader
• Transfers are receiver driven!
• All errors are retried 10 times.
• The receiver has a 10-second timeout.
• Variable length checksum depending on the transfer mode:
  • normal/classic/original: 1 byte
  • crc mode: 2 bytes

WORK IN PROGRESS

Questions

• What is the frequency that the receiver sends out the NCG byte to start the transfer? - 3 seconds?

Testing

• The suite will have Mocha tests built in, some good documentation is available
• https://docs.travis-ci.com/user/common-build-problems/#Troubleshooting-Locally-in-a-Docker-Image