[HMLGW] Automatic reconnect does not work if hmlangw is used

[andyboeh]

I use a HM-MOD-UART on a CP210x USB-serial converter on an OpenWrt router. I successfully compiled hmlangw for OpenWrt (https://github.com/andyboeh/hmlangw). This is fine as long as the gateway does not crash or reboot. If the gateway is restarted, Homegear has troubles reconnecting:

06/12/21 11:01:53.645 HM-LGW "Cube1": Error: No init packet received.
06/12/21 11:01:54.486 HM-LGW "Cube1": Warning: !!!Not!!! sending (Port 2001): K04
06/12/21 11:01:54.677 HM-LGW "Cube1": Warning: Connection closed. Trying to reconnect...
06/12/21 11:01:54.677 HM-LGW "Cube1": Info: No AES key specified in homematicbidcos.conf for communication with your HM-LGW. Disabling AES.
06/12/21 11:01:54.681 HM-LGW "Cube1": Connected to HM-LGW with hostname archerc7.lan on port 2000.
06/12/21 11:01:54.681 HM-LGW "Cube1": Info: Init packet received: H05,01,Revilo-HM-LGW,0.0.2,REQ0913185
S06,BidCoS-over-LAN-1.0
06/12/21 11:01:55.486 HM-LGW "Cube1": Info: Keep alive init packet received: H05,01,Revilo-HM-LGW,0.0.2,REQ0913185
06/12/21 11:02:24.681 HM-LGW "Cube1": Error: No init packet received.

This goes on for several minutes until it eventually succeeds.

On the OpenWrt-side, I can see the following log if it works:

Written serial number REQ0913185 to /tmp/serialnumber.txt
serial fd 3 name /dev/ttyHM
reset fd -1 gpio port -1
bidcosThread started!
keepAliveThread started!
Client 192.168.17.157 connected to BidCos port!
Client 192.168.17.157 connected to keepalive port!
Received 9 bytes from sockFd
sync data: >02,0000
received 9 bytes: >00,0000
received 15 bytes: L00,02,00FF,00
received 4 bytes: K01
Received 8 bytes from sockFd
0000: fd 00 03 00 00 03 18 0a  ........
Received 9 bytes from serial
0000: fd 00 04 00 00 04 01 99 3d  ........=
Received 18 bytes from serial
0000: fd 00 0d 00 00 00 43 6f 5f 43 50 55 5f 41 70 70  ......Co_CPU_App
0010: d8 31  .1
Received 8 bytes from sockFd
0000: fd 00 03 00 01 02 1e 0c  ........
Received 15 bytes from serial
0000: fd 00 0a 00 01 04 02 01 00 03 01 04 01 be 8a  ...............
Received 9 bytes from sockFd
0000: fd 00 04 00 02 0a 00 3d 10  .......=.
Received 9 bytes from serial
0000: fd 00 04 00 02 04 01 19 16  .........
Received 8 bytes from sockFd
0000: fd 00 03 00 03 0b 92 39  .......9
Received 19 bytes from serial
0000: fd 00 0e 00 03 04 02 52 45 51 30 39 31 33 31 38  .......REQ091318
0010: 35 66 46  5fF

...and if it doesn't succeed in reconnecting...

Written serial number REQ0913185 to /tmp/serialnumber.txt
serial fd 3 name /dev/ttyHM
reset fd -1 gpio port -1
bidcosThread started!
keepAliveThread started!
Client 192.168.17.157 connected to BidCos port!
Client 192.168.17.157 connected to keepalive port!
received 9 bytes: >07,0000
received 15 bytes: L00,02,00FF,00
received 4 bytes: K01
received 4 bytes: K02
received 4 bytes: K03
BidCos client closed connection.
Keepalive client closed connection.
Client 192.168.17.157 connected to BidCos port!
Client 192.168.17.157 connected to keepalive port!
received 9 bytes: >04,0000
received 15 bytes: L00,02,00FF,00
received 4 bytes: K01
received 4 bytes: K02
received 4 bytes: K03
BidCos client closed connection.
Keepalive client closed connection.
Client 192.168.17.157 connected to BidCos port!
Client 192.168.17.157 connected to keepalive port!
received 9 bytes: >04,0000
received 15 bytes: L00,02,00FF,00
received 4 bytes: K01
received 4 bytes: K02
received 4 bytes: K03
BidCos client closed connection.