KNX empty UDP packets sent to the network

[oblaise]

PROBLEM DESCRIPTION

Empty KNX packets are sent after receiving a valid KNX UDP routing packet.

Each time the device receive a valid KNX routing indication packet it generates an empty KNX routing packet (UDP payload len=0) that is send to the network.

This issue happened after the 6.6.0 -> 6.7.1 upgrade and is always present in the latest firmware.

I observed the issue when KNX related software started to issue warnings due to invalid packets after the firmware upgrade.

REQUESTED INFORMATION

Make sure your have performed every step and checked the applicable boxes before submitting your issue. Thank you!

• Read the Contributing Guide and Policy and the Code of Conduct
• Searched the problem in issues
• [x ] Searched the problem in the docs
• Searched the problem in the forum
• Searched the problem in the chat
• Device used (e.g., Sonoff Basic): Sonoff S26 + development board
• Tasmota binary firmware version number used: 6.6.0, 6.7.1, 8.2.0 & 8.2.0.6
  • Pre-compiled
  • Self-compiled
    • IDE / Compiler used: _____
• Flashing tools used: OTA/firmware upgrade
• Provide the output of command: Backlog Template; Module; GPIO 255:

06:26:07 RSL: RESULT = {"NAME":"Generic","GPIO":[255,255,255,255,255,255,255,255,255,255,255,255,255],"FLAG":1,"BASE":18}
06:26:07 RSL: RESULT = {"Module":{"18":"Generic"}}
06:26:08 RSL: RESULT = {"GPIO0":{"0":"None"},"GPIO1":{"0":"None"},"GPIO2":{"56":"Led1i"},"GPIO3":{"0":"None"},"GPIO4":{"0":"None"},"GPIO5":{"0":"None"},"GPIO9":{"0":"None"},"GPIO10":{"0":"None"},"GPIO12":{"0":"None"},"GPIO13":{"21":"Relay1"},"GPIO14":{"17":"Button1"},"GPIO15":{"0":"None"},"GPIO16":{"0":"None"}}

• If using rules, provide the output of this command: Backlog Rule1; Rule2; Rule3:

  Rules output here:

• Provide the output of this command: Status 0:

06:27:04 RSL: STATUS = {"Status":{"Module":18,"FriendlyName":["Sonoff"],"Topic":"sonoff","ButtonTopic":"0","Power":1,"PowerOnState":3,"LedState":1,"LedMask":"FFFF","SaveData":1,"SaveState":1,"SwitchTopic":"0","SwitchMode":[0,0,0,0,0,0,0,0],"ButtonRetain":0,"SwitchRetain":0,"SensorRetain":0,"PowerRetain":0}}
06:27:04 RSL: STATUS1 = {"StatusPRM":{"Baudrate":115200,"SerialConfig":"8N1","GroupTopic":"sonoffs","OtaUrl":"http://thehackbox.org/tasmota/release/sonoff-knx.bin","RestartReason":"Software/System restart","Uptime":"0T00:01:31","StartupUTC":"2020-05-04T05:25:33","Sleep":50,"CfgHolder":4617,"BootCount":11,"BCResetTime":"2020-05-04T06:17:13","SaveCount":114,"SaveAddress":"F4000"}}
06:27:04 RSL: STATUS2 = {"StatusFWR":{"Version":"8.2.0.6(d410420-knx)","BuildDateTime":"2020-05-03T19:01:09","Boot":31,"Core":"2_7_0","SDK":"2.2.2-dev(38a443e)","Hardware":"ESP8266EX","CR":"371/699"}}
06:27:04 RSL: STATUS3 = {"StatusLOG":{"SerialLog":2,"WebLog":2,"MqttLog":0,"SysLog":0,"LogHost":"","LogPort":514,"SSId":["xxxxxx",""],"TelePeriod":300,"Resolution":"558180C0","SetOption":["82008001","2805C8000100060000005AFF000000000000","00000000","00000000"]}}
06:27:04 RSL: STATUS4 = {"StatusMEM":{"ProgramSize":585,"Free":416,"Heap":23,"ProgramFlashSize":1024,"FlashSize":4096,"FlashChipId":"16405E","FlashMode":3,"Features":["00000809","9FDAE597","042683B0","000000CD","010013C0","8000F181","00000024"],"Drivers":"1,2,3,4,5,6,7,8,9,10,11,12,16,18,19,22,24,26,27,30,35,37","Sensors":"1,2,3,4,5,6"}}
06:27:04 RSL: STATUS5 = {"StatusNET":{"Hostname":"sonoff-3425","IPAddress":"172.x.x.x","Gateway":"172.x.x.x","Subnetmask":"255.255.255.0","DNSServer":"172.xx.x.x","Mac":"DC:4F:22:21:4D:61","Webserver":2,"WifiConfig":4,"WifiPower":17.0}}
06:27:04 RSL: STATUS7 = {"StatusTIM":{"UTC":"2020-05-04T05:27:04","Local":"2020-05-04T06:27:04","StartDST":"2020-03-29T02:00:00","EndDST":"2020-10-25T03:00:00","Timezone":"+01:00","Sunrise":"05:23","Sunset":"20:10"}}
06:27:04 RSL: STATUS10 = {"StatusSNS":{"Time":"2020-05-04T06:27:04"}}
06:27:04 RSL: STATUS11 = {"StatusSTS":{"Time":"2020-05-04T06:27:04","Uptime":"0T00:01:31","UptimeSec":91,"Heap":23,"SleepMode":"Dynamic","Sleep":50,"LoadAvg":19,"MqttCount":0,"POWER":"ON","Wifi":{"AP":1,"SSId":"xxxxx","BSSId":"00:1D:A1:76:A5:22","Channel":6,"RSSI":56,"Signal":-72,"LinkCount":1,"Downtime":"0T00:00:05"}}}

• Provide the output of the Console log output when you experience your issue; if applicable:
  (Please use weblog 4 for more debug information)

N/A

TO REPRODUCE

Enable KNX, Define a KNX group address linked to the Output 1 (Output 1 -> KNX group address) and define a KNX group address as input (KNX Group Address -> Output 1). As soon as you have defined the latest settings the issue start to happens on the network.

EXPECTED BEHAVIOUR

No empty UDP packet should be send to the network

SCREENSHOTS

ADDITIONAL CONTEXT

N/A

(Please, remember to close the issue when the problem has been addressed)

[ascillato2]

Hi,

Thanks for reporting.

This problem is not in Tasmota but in the core. It was reported before in Tasmota at: #5053 and then it goes to the KNX Library: envy/esp-knx-ip#68 but it ends up being an issue at UDP of the arduino core. In that moment was solved in the core by Arduino Core Devs and in Tasmota by the use of the latest arduino core. As you are using a precompiled bin of the latest Tasmota version, that means that you are using latest arduino core too. We should investigate it and report again to the Arduino core.

Again, thanks for reporting. 👍

[ascillato2]

#8459 (comment)