Daemon to communicate with the heating system via ebus

ebus (energy bus) is a serial communication protocoll used in heating systems.

ebusd acts like a proxy. On the one hand it is listing on a TCP port 8888 for incoming telnet connections. On the other hand it sends and receive ebus message via ebus-usb adapter to or from the ebus.

• ebus - send and receive ebus commands

  • send Broadcast (BC), Master-Master (MM) and Master-Slave (MS) messages
  • calculate CRC for sending data and check CRC of received data
  • not allowed byte sequences inside data will be escaped and unescaped
  • it saved data from specified cycle messages

• telnet - multi telnet session (listen on TCP port 8888) The available commands are different of each heating system and provider. This commands are defined in csv files which will be parsed on daemon startup.

  Commands:

  • get send message (BC, MM or MS) to slave and decoded received answer
  • set send data to the slave with the intention to adjust this value
  • cyc return data from collected cycle messages
  • loglevel change loglevel at runtime
  • quit disconnect from daemon
  • shutdown stop daemon

$ ./autogen.sh

This script execute the following commands in this order.

$ aclocal $ autoconf $ autoheader $ automake $ ./configure $ make

The daemon will search ist configuration file ebusd.conf primary at /etc/ebusd. This can be override by given commandline option -C. For detailed help of daemon configuration try ./ebusd -h or take a look at ebusd.conf file.

In short some description to the neccassarry structure of the csv files.

• [ 3] type - type of command (get, set, cyc)
• [ 5] class - comand class (ci, ...)
• [ 30] cmd - command (password, ...)
• [ 256] com - description of the command
• [ int] s_type - ebus message type (BC = 1, MM = 2 or MS = 3)
• [ 2] s_zz - hex address from slave (15)
• [ 4] s_cmd - primary and secendory ebus command (e.g. B509)
• [ int] s_len - length of data bytes
• [ 32] s_msg - data bytes of message
• [ int] d_elem - number of elements from different data types

For each different data type must defined the follow struture

• [ 20] d_sub - subcommand (pin1, ...)
• [ 2] d_part - part of message for data bytes (MD, SA, SD, MA)
• [ 10] d_pos - position at data bytes (1, 2, 3, ...)
• [ 3] d_type - data type (asc, bcd, ...))
• [float] d_fac - facter to scale data (1.0, 0.02, ...)
• [ 6] d_unit - unit of data (°C, ...)
• [ 30] d_valid - possible entrys (01, 02, 03, ...)
• [ 256] d_com - description of sub command

Different data types [decode|encode]:

• [de] x - asc - ascii
• [de] 1 - bcd - bcd
• [de] 1 - d1b - data1b
• [de] 1 - d1c - data1c
• [de] 2 - d2b - data2b
• [de] 2 - d2c - data2c
• [d ] 3 - bda - date (bcd format)
• [de] 3 - hda - date (hex format)
• [d ] 3 - bti - time (bcd format)
• [de] 3 - hti - time (hex format)
• [d ] 1 - bdy - day (bcd format)
• [de] 1 - hdy - day (hex format)
• [d ] x - hex - print data only with 2-nibble hex format
• [d ] 4 - ulg - unsigned long

The author can be contacted at [email protected].