nodemcu-uploader.py

A simple tool for uploading files to the filesystem of an ESP8266 running NodeMCU as well as some other useful commands.

It should work on Linux, and OS X; and with any type of file that fits the filesystem, binary or text.

master	next
Please note that these tests is not complete and it might be the tests
themselves that are having issues.

Installation

Should be installable by PyPI (prefered) but there might be packaging issues still.

pip install nodemcu-uploader
nodemcu-uploader

Otherwise clone from github and run directly from there

git clone https://github.com/kmpm/nodemcu-uploader
cd nodemcu-uploader
python ./nodemcu-uploader.py

Note that pip would install pyserial >= 2.7. The terminal command (using miniterm from pyserial) might not work depending on version used. This is a known issue.

Notes for Windows

There might be some significant issues with Windows.

Notes for OS X

To solve "ImportError: No module named serial", install the pyserial module:

python easy_install pyserial

Usage

See doc/USAGE.md

Issues

Create a issue in github, https://github.com/kmpm/nodemcu-uploader/issues

Technical Details

This uses almost an implementation of xmodem protocol for the up-/download part. The main missing part is checksum and retransmission.

This is made possible by first preparing the device by creating a set of helper functions using the ordinary terminal mode. These function utilize the built in uart module for the actual transfer and cuts up the transfers to a set of manageable blocks that are reassembled in the receiving end.

Upload

1. Client calls the function recv()
2. NodeMCU disables echo and send a 'C' to tell that it's ready to receive data
3. Client sends a filename terminated with 0x00
4. NodeMCU sends ACK
5. Client send block of data according to the definition.
6. NodeMCU sends ACK
7. Step 5 and 6 are repeated until NodeMCU receives a block with 0 as size.
8. NodeMCU enables normal terminal again with echo

Download

1. Client calls the function send().
2. NodeMCU disables echo and waits for start.
3. Client send a 'C' to tell that it's ready to receive data
4. NodeMCU sends a filename terminated with 0x00
5. Client sends ACK
6. NodeMCU send block of data according to the definition.
7. Client sends ACK
8. Step 5 and 6 are repeated until client receives a block with 0 as size.
9. NodeMCU enables normal terminal again with echo.

Data Block Definition

SOH, size, data[128]

• SOH = 0x01
• Single byte telling how much of the 128 bytes data that are actually used.
• Data padded with random bytes to fill out the 128 bytes frame.

This gives a total 130 bytes per block.

The block size was decided for...

1. Being close to xmodem from where the inspiration came
2. A fixed size allow the use of the uart.on('data') event very easy.
3. 130 bytes would fit in the receive buffer buffer.
4. It would not waste that much traffic if the total size uploaded was not a multiple of the allowed datasize.

Disclaimer

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.