pyMeterBus 0.7.8

Description: Meter-Bus for Python
====================
[](https://travis-ci.org/ganehag/pyMeterBus) [](https://codecov.io/gh/ganehag/pyMeterBus)

About
-----

[M-Bus](http://www.m-bus.com/) (Meter-Bus) is a European standard (EN 13757-2 physical and link layer, EN 13757-3 application layer) for the remote reading of gas or electricity meters. M-Bus is also usable for other types of consumption meters. The M-Bus interface is made for communication on two wires, making it very cost effective.


Current State
-------------

This implementation is currently under heavy development. It is targeted at a very specific solution. Thus only the *variable data structure* is implemented. However the missing pieces will be implemented in the future.

Tools
-----

You can find a set of utilities in the `tools` folder.

* mbus-serial-request-data.py
* mbus-serial-request-data-multi-reply.py
* mbus-serial-scan.py

These tools can communicate over a serial device `/dev/ttyX` or even over RFC2217 using the format `rfc2217://host:port`.

If you are using `ser2net` as a RFC2217 server. You need to configure it the following way:

```
2000:telnet:0:/dev/ttySX:2400 remctl banner
```

Known Issues
------------
* Missing: Fixed data structure parsing.
* Missing: Encoding to M-Bus frames.
* Missing: Slave configuration.
* Missing: Interface code (Serial, TCP/IP)
* Missing: Extended VIF codes.


What works
----------

* Parsing of complete telegram.
* Parsing of just Used Data segment.
* Generation of basic JSON structure from telegram/user-data/record.


Code examples
-------

### Decode the value of a single record (record 3)
```python
#!/usr/bin/python

import meterbus

data = "\x68\x6A\x6A\x68\x08\x01\x72\x43\x53\x93\x07\x65" \
"\x32\x10\x04\xCA\x00\x00\x00\x0C\x05\x14\x00\x00" \
"\x00\x0C\x13\x13\x20\x00\x00\x0B\x22\x01\x24\x03" \
"\x04\x6D\x12\x0B\xD3\x12\x32\x6C\x00\x00\x0C\x78" \
"\x43\x53\x93\x07\x06\xFD\x0C\xF2\x03\x01\x00\xF6" \
"\x01\x0D\xFD\x0B\x05\x31\x32\x4D\x46\x57\x01\xFD" \
"\x0E\x00\x4C\x05\x14\x00\x00\x00\x4C\x13\x13\x20" \
"\x00\x00\x42\x6C\xBF\x1C\x0F\x37\xFD\x17\x00\x00" \
"\x00\x00\x00\x00\x00\x00\x02\x7A\x25\x00\x02\x78" \
"\x25\x00\x3A\x16"

telegram = meterbus.load(data)
print telegram.records[3].parsed_value
```

```shell
~$ 2014-02-19T11:18
```

### Request a frame over Serial and dump it in JSON format
```python
#!/usr/bin/python

import serial
import meterbus

address = 254

with serial.Serial('/dev/ttyACM0', 2400, 8, 'E', 1, 0.5) as ser:
meterbus.send_ping_frame(ser, address)
frame = meterbus.load(meterbus.recv_frame(ser, 1))
assert isinstance(frame, meterbus.TelegramACK)

meterbus.send_request_frame(ser, address)
frame = meterbus.load(meterbus.recv_frame(ser, meterbus.FRAME_DATA_LENGTH))
assert isinstance(frame, meterbus.TelegramLong)

print(frame.to_JSON())
```

M-Bus Packet Format
-------------------

| Single Character | Short Frame | Control Frame | Long Frame |
|------------------|-------------|---------------|------------------------|
| E5h | Start 10h | Start 68h | Start 68h |
| | C Field | L Field = 3 | L Field |
| | A Field | L Field = 3 | L Field |
| | Check Sum | Start 68h | Start 68h |
| | Stop 16h | C Field | C Field |
| | | A Field | A Field |
| | | CI Field | CI Field |
| | | Check Sum | User Data (0-252 Byte) |
| | | Stop 16h | Check Sum |
| | | | Stop 16h |



License
-------
Please see the [LICENSE](LICENSE) file

Platform: UNKNOWN
Classifier: Development Status :: 4 - Beta
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: BSD License
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3.3
Classifier: Programming Language :: Python :: 3.4
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.6
Classifier: Topic :: Software Development :: Libraries