ECHO problems when sending with no payload

karlheinz2000

I have this LED matrix to display time and text https://forum.mysensors.org/post/102819.
Text is sent from controller (fhem), time is only requested once from node and the runs only on node.
To switch from text to time, controller sends "" (no text). Node checks received data for NULL.

strcpy(tempMessage, message.getString());        // copy it in
      if (tempMessage[0] == NULL) {                    //time

I didn't use the text option for a long time. Now it does not work anymore.
If controller sends "", node receives "]" and this does not work with NULL.
Did anything change in MySensors?
How can I debug what raw data is received? Maybe some changes on controller side...

frits

Hi, can you provide the node's debug output? It should show what data was received.

karlheinz2000

Debug does not help. According to debug payload is empty "" (or space). When I get the payload in receive() it reads "]".

frits

I don't use FHEM but tested with MySController.

Check message.getString() for NULL!

...
  char tempMessage[32];
  char * ret = message.getString ( );
  if ( NULL == ret )
  {
    MY_SERIALDEVICE.println ( "ret is <null>" );
  }
  else
  {
    strcpy(tempMessage, ret );        // copy it in
    MY_SERIALDEVICE.println ( tempMessage[0] );
  }

Now if you send in an empty string, you will receive:

27148 TSF:MSG:READ,0-0-124,s=36,c=1,t=47,pt=1,l=1,sg=1:0
length: 1, type: 47
ret is <null>

(Note: payload length is 1 even if message is empty)
Also check your data type, if it's not P_STRING, you'll get NULL!. See MyMessage.cpp:

const char* MyMessage::getString(void) const
{
	if (this->getPayloadType() == P_STRING) {
		return this->data;
	} else {
		return NULL;
	}
}

karlheinz2000

@frits thanks for supporting. This works.

karlheinz2000

@frits, can you please check, if MySController reads correct ECHO from a no payload message? I have some ECHO problems, when sending with no payload. But maybe FHEM related...

frits

Hi,

sending an empty V_TEXT with "ACK" = "YES":

MySensors Ethernet Gateway

1896935 GWT:RFC:MSG=123;1;1;1;47;                                               
1896941 TSF:MSG:SEND,0-0-123-123,s=1,c=3,t=16,pt=0,l=0,sg=1,ft=0,st=OK:         
1897074 TSF:MSG:READ,123-123-0,s=255,c=3,t=17,pt=6,l=25,sg=1:<NONCE>            
1897195 TSF:MSG:SEND,0-0-123-123,s=1,c=1,t=47,pt=1,l=1,sg=1,ft=0,st=OK:0        
1897365 TSF:MSG:READ,123-123-0,s=1,c=1,t=47,pt=1,l=1,sg=0:0                     
1897371 TSF:MSG:ECHO

MySensors Node

812210 TSF:MSG:READ,0-0-123,s=1,c=3,t=16,pt=0,l=0,sg=1:
812216 SGN:SKP:MSG CMD=3,TYPE=16
812292 SGN:SKP:MSG CMD=3,TYPE=17
812300 TSF:MSG:SEND,123-123-0-0,s=255,c=3,t=17,pt=6,l=25,sg=1,ft=0,st=OK:<NONCE>
812308 SGN:NCE:XMT,TO=123
812445 TSF:MSG:READ,0-0-123,s=1,c=1,t=47,pt=1,l=1,sg=1:0
812451 SGN:BND:NONCE=xxxxxx
812566 SGN:BND:HMAC=xxxxx
812574 SGN:VER:OK
812576 TSF:MSG:ECHO REQ
812580 SGN:SKP:ECHO CMD=1,TYPE=47
812584 TSF:MSG:SEND,123-123-0-0,s=1,c=1,t=47,pt=1,l=1,sg=0,ft=0,st=OK:0

karlheinz2000

Is 2.3.2 running on your GW?
I see different behaviour between 2.3.2 and old 2.2.0.
With 2.3.2 on GW I see ECHO problems, with 2.0.0 everything is fine.
First running a 2.3.2 GW, then switch to a 2.2.0 GW.
The 2.3.2 version is adding a "0", which causes problems.

12.11.2020 22:24:11	TX	70;0;1;1;47;
12.11.2020 22:24:11	RX	0;255;3;0;9;41152 TSF:MSG:SEND,0-0-70-70,s=0,c=1,t=47,pt=1,l=1,sg=0,ft=0,st=OK:0
12.11.2020 22:24:11	RX	0;255;3;0;9;41174 TSF:MSG:READ,70-70-0,s=0,c=1,t=47,pt=1,l=1,sg=0:0
12.11.2020 22:24:11	RX	0;255;3;0;9;41192 TSF:MSG:ECHO
12.11.2020 22:24:11	RX	70;0;1;1;47;0
12.11.2020 22:25:10	INFO	Disconnected
12.11.2020 22:25:24	INFO	Flushing FIFO
12.11.2020 22:25:24	INFO	Connected to COM4
12.11.2020 22:25:29	TX	70;0;1;1;47;
12.11.2020 22:25:29	RX	0;255;3;0;9;192065 TSF:MSG:SEND,0-0-70-70,s=0,c=1,t=47,pt=0,l=0,sg=0,ft=0,st=OK:
12.11.2020 22:25:29	RX	0;255;3;0;9;192088 TSF:MSG:READ,70-70-0,s=0,c=1,t=47,pt=0,l=0,sg=0:
12.11.2020 22:25:29	RX	0;255;3;0;9;192106 TSF:MSG:ACK
12.11.2020 22:25:29	RX	70;0;1;1;47;

frits

Hi,

yes, it's 2.3.2:

0 MCO:BGN:INIT GW,CP=RNNGAA--,FQ=8,REL=255,VER=2.3.2                            
38 TSM:INIT                                                                     
40 TSF:WUR:MS=0                                                                 
47 TSM:INIT:TSP OK                                                              
49 TSM:INIT:GW MODE                                                             
51 TSM:READY:ID=0,PAR=0,DIS=0                                                   
55 MCO:REG:NOT NEEDED                                                           
618 GWT:TIN:IP=192.168.99.13                                                    
1622 MCO:BGN:STP                                                                
***********************************************                                 
MySensors Ethernet Gateway                                                      
Version 0.1                                                                     
own mac address: DE:AD:BA:BE:99:13                                              
own network address: 192.168.99.13                                              
Gateway type: MysGW                                                             
network port: 5003                                                              
Radio type: NRF24                                                               
signing: yes                                                                    
2140 MCO:BGN:INIT OK,TSP=1                                                      
2148 TSM:READY:NWD REQ                                                          
2154 ?TSF:MSG:SEND,0-0-255-255,s=255,c=3,t=20,pt=0,l=0,sg=0,ft=0,st=OK:

frits

here's the requests with 2.2.0.

Gateway:

0 MCO:BGN:INIT GW,CP=RNNGA---,VER=2.2.0                                         
4 TSM:INIT                                                                      
4 TSF:WUR:MS=0                                                                  
12 TSM:INIT:TSP OK                                                              
14 TSM:INIT:GW MODE                                                             
16 TSM:READY:ID=0,PAR=0,DIS=0                                                   
18 MCO:REG:NOT NEEDED                                                           
583 GWT:TIN:IP=192.168.99.13                                                    
1587 MCO:BGN:STP                                                                
***********************************************                                 
MySensors Ethernet Gateway                                                      
Version 0.1                                                                     
own mac address: DE:AD:BA:BE:99:13                                              
own network address: 192.168.99.13                                              
Gateway type: MysGW                                                             
network port: 5003                                                              
Radio type: NRF24                                                               
signing: no                                                                     
2105 MCO:BGN:INIT OK,TSP=1             
36448 TSF:MSG:READ,123-123-255,s=255,c=3,t=7,pt=0,l=0,sg=0:                     
36454 TSF:MSG:BC                                                                
36456 TSF:MSG:FPAR REQ,ID=123                                                   
36460 TSF:PNG:SEND,TO=0                                                         
36462 TSF:CKU:OK                                                                
36464 TSF:MSG:GWL OK                                                            
37095 TSF:MSG:SEND,0-0-123-123,s=255,c=3,t=8,pt=1,l=1,sg=0,ft=0,st=OK:0         
38502 TSF:MSG:READ,123-123-0,s=255,c=3,t=24,pt=1,l=1,sg=0:1                     
38510 TSF:MSG:PINGED,ID=123,HP=1                                                
38514 TSF:MSG:SEND,0-0-123-123,s=255,c=3,t=25,pt=1,l=1,sg=0,ft=0,st=OK:1        
38531 TSF:MSG:READ,123-123-0,s=255,c=3,t=15,pt=6,l=2,sg=0:0100                  
38539 TSF:MSG:SEND,0-0-123-123,s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=OK:0100     
38549 TSF:MSG:READ,123-123-0,s=255,c=0,t=17,pt=0,l=5,sg=0:2.2.0                 
38557 TSF:MSG:READ,123-123-0,s=255,c=3,t=6,pt=1,l=1,sg=0:0                      
38567 GWT:TSA:ETH OK                                                            
38576 GWT:RFC:MSG=123;255;3;0;6;M                                               
38582 TSF:MSG:SEND,0-0-123-123,s=255,c=3,t=6,pt=0,l=1,sg=0,ft=0,st=OK:M         
38590 TSF:MSG:READ,123-123-0,s=255,c=3,t=11,pt=0,l=20,sg=0:Hello MySensors 328P 
38602 TSF:MSG:READ,123-123-0,s=255,c=3,t=12,pt=0,l=3,sg=0:1.3                   
38612 TSF:MSG:READ,123-123-0,s=0,c=0,t=36,pt=0,l=6,sg=0:system                  
38623 TSF:MSG:READ,123-123-0,s=1,c=0,t=36,pt=0,l=9,sg=0:timestamp               
38633 TSF:MSG:READ,123-123-0,s=2,c=0,t=3,pt=0,l=3,sg=0:led                      
38645 TSF:MSG:READ,123-123-0,s=255,c=3,t=26,pt=1,l=1,sg=0:2                     
38653 TSF:MSG:SEND,0-0-123-123,s=255,c=3,t=27,pt=1,l=1,sg=0,ft=0,st=OK:1        
85934 GWT:RFC:MSG=123;1;1;1;47;hello                                            
85940 TSF:MSG:SEND,0-0-123-123,s=1,c=1,t=47,pt=0,l=5,sg=0,ft=0,st=OK:hello      
85950 TSF:MSG:READ,123-123-0,s=1,c=1,t=47,pt=0,l=5,sg=0:hello                   
85958 TSF:MSG:ACK                                                               
93378 GWT:RFC:MSG=123;1;1;1;47;next message empty                               
93386 TSF:MSG:SEND,0-0-123-123,s=1,c=1,t=47,pt=0,l=18,sg=0,ft=0,st=OK:next messa
ge empty                                                                        
93399 TSF:MSG:READ,123-123-0,s=1,c=1,t=47,pt=0,l=18,sg=0:next message empty     
93407 TSF:MSG:ACK                                                               
96987 GWT:RFC:MSG=123;1;1;1;47;                                                 
96993 TSF:MSG:SEND,0-0-123-123,s=1,c=1,t=47,pt=0,l=0,sg=0,ft=0,st=OK:           
97001 TSF:MSG:READ,123-123-0,s=1,c=1,t=47,pt=0,l=0,sg=0:                        
97007 TSF:MSG:ACK

Node:

0 MCO:BGN:INIT GW,CP=RNNGA---,VER=2.2.0                                         
4 TSM:INIT                                                                      
4 TSF:WUR:MS=0                                                                  
12 TSM:INIT:TSP OK                                                              
14 TSM:INIT:GW MODE                                                             
16 TSM:READY:ID=0,PAR=0,DIS=0                                                   
18 MCO:REG:NOT NEEDED                                                           
583 GWT:TIN:IP=192.168.99.13                                                    
1587 MCO:BGN:STP                                                                
***********************************************                                 
MySensors Ethernet Gateway                                                      
Version 0.1                                                                     
own mac address: DE:AD:BA:BE:99:13                                              
own network address: 192.168.99.13                                              
Gateway type: MysGW                                                             
network port: 5003                                                              
Radio type: NRF24                                                               
signing: no                                                                     
2105 MCO:BGN:INIT OK,TSP=1             
36448 TSF:MSG:READ,123-123-255,s=255,c=3,t=7,pt=0,l=0,sg=0:                     
36454 TSF:MSG:BC                                                                
36456 TSF:MSG:FPAR REQ,ID=123                                                   
36460 TSF:PNG:SEND,TO=0                                                         
36462 TSF:CKU:OK                                                                
36464 TSF:MSG:GWL OK                                                            
37095 TSF:MSG:SEND,0-0-123-123,s=255,c=3,t=8,pt=1,l=1,sg=0,ft=0,st=OK:0         
38502 TSF:MSG:READ,123-123-0,s=255,c=3,t=24,pt=1,l=1,sg=0:1                     
38510 TSF:MSG:PINGED,ID=123,HP=1                                                
38514 TSF:MSG:SEND,0-0-123-123,s=255,c=3,t=25,pt=1,l=1,sg=0,ft=0,st=OK:1        
38531 TSF:MSG:READ,123-123-0,s=255,c=3,t=15,pt=6,l=2,sg=0:0100                  
38539 TSF:MSG:SEND,0-0-123-123,s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=OK:0100     
38549 TSF:MSG:READ,123-123-0,s=255,c=0,t=17,pt=0,l=5,sg=0:2.2.0                 
38557 TSF:MSG:READ,123-123-0,s=255,c=3,t=6,pt=1,l=1,sg=0:0                      
38567 GWT:TSA:ETH OK                                                            
38576 GWT:RFC:MSG=123;255;3;0;6;M                                               
38582 TSF:MSG:SEND,0-0-123-123,s=255,c=3,t=6,pt=0,l=1,sg=0,ft=0,st=OK:M         
38590 TSF:MSG:READ,123-123-0,s=255,c=3,t=11,pt=0,l=20,sg=0:Hello MySensors 328P 
38602 TSF:MSG:READ,123-123-0,s=255,c=3,t=12,pt=0,l=3,sg=0:1.3                   
38612 TSF:MSG:READ,123-123-0,s=0,c=0,t=36,pt=0,l=6,sg=0:system                  
38623 TSF:MSG:READ,123-123-0,s=1,c=0,t=36,pt=0,l=9,sg=0:timestamp               
38633 TSF:MSG:READ,123-123-0,s=2,c=0,t=3,pt=0,l=3,sg=0:led                      
38645 TSF:MSG:READ,123-123-0,s=255,c=3,t=26,pt=1,l=1,sg=0:2                     
38653 TSF:MSG:SEND,0-0-123-123,s=255,c=3,t=27,pt=1,l=1,sg=0,ft=0,st=OK:1        
85934 GWT:RFC:MSG=123;1;1;1;47;hello                                            
85940 TSF:MSG:SEND,0-0-123-123,s=1,c=1,t=47,pt=0,l=5,sg=0,ft=0,st=OK:hello      
85950 TSF:MSG:READ,123-123-0,s=1,c=1,t=47,pt=0,l=5,sg=0:hello                   
85958 TSF:MSG:ACK                                                               
93378 GWT:RFC:MSG=123;1;1;1;47;next message empty                               
93386 TSF:MSG:SEND,0-0-123-123,s=1,c=1,t=47,pt=0,l=18,sg=0,ft=0,st=OK:next messa
ge empty                                                                        
93399 TSF:MSG:READ,123-123-0,s=1,c=1,t=47,pt=0,l=18,sg=0:next message empty     
93407 TSF:MSG:ACK                                                               
96987 GWT:RFC:MSG=123;1;1;1;47;                                                 
96993 TSF:MSG:SEND,0-0-123-123,s=1,c=1,t=47,pt=0,l=0,sg=0,ft=0,st=OK:           
97001 TSF:MSG:READ,123-123-0,s=1,c=1,t=47,pt=0,l=0,sg=0:                        
97007 TSF:MSG:ACK

frits

sorry, ctr-c didn't work
Node:

 
 __  __       ____
|  \/  |_   _/ ___|  ___ _ __  ___  ___  _ __ ___
| |\/| | | | \___ \ / _ \ `_ \/ __|/ _ \| `__/ __|
| |  | | |_| |___| |  __/ | | \__ \  _  | |  \__ \
|_|  |_|\__, |____/ \___|_| |_|___/\___/|_|  |___/
        |___/                      2.2.0

16 MCO:BGN:INIT NODE,CP=RNNNA---,VER=2.2.0
26 MCO:BGN:BFR
***********************************************
Hello MySensors 328P
Version 1.3
Radio type: NRF24
signing: no
32 TSM:INIT
40 TSF:WUR:MS=0
47 TSM:INIT:TSP OK
49 TSM:INIT:STATID=123
51 TSF:SID:OK,ID=123
53 TSM:FPAR
90 TSF:MSG:SEND,123-123-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
700 TSF:MSG:READ,0-0-123,s=255,c=3,t=8,pt=1,l=1,sg=0:0
706 TSF:MSG:FPAR OK,ID=0,D=1
2099 TSM:FPAR:OK
2099 TSM:ID
2101 TSM:ID:OK
2103 TSM:UPL
2107 TSF:MSG:SEND,123-123-0-0,s=255,c=3,t=24,pt=1,l=1,sg=0,ft=0,st=OK:1
2117 TSF:MSG:READ,0-0-123,s=255,c=3,t=25,pt=1,l=1,sg=0:1
2123 TSF:MSG:PONG RECV,HP=1
2127 TSM:UPL:OK
2129 TSM:READY:ID=123,PAR=0,DIS=1
2134 TSF:MSG:SEND,123-123-0-0,s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=OK:0100
2142 TSF:MSG:READ,0-0-123,s=255,c=3,t=15,pt=6,l=2,sg=0:0100
2152 TSF:MSG:SEND,123-123-0-0,s=255,c=0,t=17,pt=0,l=5,sg=0,ft=0,st=OK:2.2.0
2160 TSF:MSG:SEND,123-123-0-0,s=255,c=3,t=6,pt=1,l=1,sg=0,ft=0,st=OK:0
2185 TSF:MSG:READ,0-0-123,s=255,c=3,t=6,pt=0,l=1,sg=0:M
2193 TSF:MSG:SEND,123-123-0-0,s=255,c=3,t=11,pt=0,l=20,sg=0,ft=0,st=OK:Hello MySensors 328P
2205 TSF:MSG:SEND,123-123-0-0,s=255,c=3,t=12,pt=0,l=3,sg=0,ft=0,st=OK:1.3
2215 TSF:MSG:SEND,123-123-0-0,s=0,c=0,t=36,pt=0,l=6,sg=0,ft=0,st=OK:system
2226 TSF:MSG:SEND,123-123-0-0,s=1,c=0,t=36,pt=0,l=9,sg=0,ft=0,st=OK:timestamp
2236 TSF:MSG:SEND,123-123-0-0,s=2,c=0,t=3,pt=0,l=3,sg=0,ft=0,st=OK:led
2244 MCO:REG:REQ
2248 TSF:MSG:SEND,123-123-0-0,s=255,c=3,t=26,pt=1,l=1,sg=0,ft=0,st=OK:2
2256 TSF:MSG:READ,0-0-123,s=255,c=3,t=27,pt=1,l=1,sg=0:1
2263 MCO:PIM:NODE REG=1
2265 MCO:BGN:STP
2267 MCO:BGN:INIT OK,TSP=1
49412 TSF:MSG:READ,0-0-123,s=1,c=1,t=47,pt=0,l=5,sg=0:hello
49420 TSF:MSG:ACK REQ
49424 TSF:MSG:SEND,123-123-0-0,s=1,c=1,t=47,pt=0,l=5,sg=0,ft=0,st=OK:hello
h
received message for sensor 1, type 47, value hello
56838 TSF:MSG:READ,0-0-123,s=1,c=1,t=47,pt=0,l=18,sg=0:next message empty
56846 TSF:MSG:ACK REQ
56850 TSF:MSG:SEND,123-123-0-0,s=1,c=1,t=47,pt=0,l=18,sg=0,ft=0,st=OK:next message empty
n
received message for sensor 1, type 47, value next message empty
60434 TSF:MSG:READ,0-0-123,s=1,c=1,t=47,pt=0,l=0,sg=0:
60440 TSF:MSG:ACK REQ
60444 TSF:MSG:SEND,123-123-0-0,s=1,c=1,t=47,pt=0,l=0,sg=0,ft=0,st=OK:

karlheinz2000

I again checked with latest 2.3.2 development lib. Same, ECHO does not work.
You use ethernet gateway, my is serial. This might be the difference...

13.11.2020 09:17:20	TX	70;0;1;1;47;
13.11.2020 09:17:20	RX	0;255;3;0;9;10969 TSF:MSG:SEND,0-0-70-70,s=0,c=1,t=47,pt=1,l=1,sg=0,ft=0,st=OK:0
13.11.2020 09:17:20	RX	0;255;3;0;9;10989 TSF:MSG:READ,70-70-0,s=0,c=1,t=47,pt=1,l=1,sg=0:0
13.11.2020 09:17:20	RX	0;255;3;0;9;11008 TSF:MSG:ECHO
13.11.2020 09:17:20	RX	70;0;1;1;47;0

I now try to setup an ethernet gateway just for test.

karlheinz2000

Same with ethernet gateway (UNO, W5100)

gateway 2.2.0

10:25:06.047 -> 73634 GWT:RFC:MSG=70;0;1;1;47;
10:25:06.047 -> 73639 TSF:MSG:SEND,0-0-70-70,s=0,c=1,t=47,pt=0,l=0,sg=0,ft=0,st=OK:
10:25:06.088 -> 73652 TSF:MSG:READ,70-70-0,s=0,c=1,t=47,pt=0,l=0,sg=0:
10:25:06.088 -> 73657 TSF:MSG:ACK

MYSController

13.11.2020 10:25:06	TX	70;0;1;1;47;
13.11.2020 10:25:06	RX	70;0;1;1;47;

gateway 2.3.2

10:30:45.718 -> 22546 GWT:RFC:MSG=70;0;1;1;47;
10:30:45.718 -> 22550 TSF:MSG:SEND,0-0-70-70,s=0,c=1,t=47,pt=1,l=1,sg=0,ft=0,st=OK:0
10:30:45.718 -> 22561 TSF:MSG:READ,70-70-0,s=0,c=1,t=47,pt=1,l=1,sg=0:0
10:30:45.718 -> 22566 TSF:MSG:ECHO

MYSController

13.11.2020 10:30:45	TX	70;0;1;1;47;
13.11.2020 10:30:45	RX	70;0;1;1;47;0

Now I have to look for some ESP board...

rejoe2

@karlheinz2000
Which type of radio you are using? There might be a difference between nRF24 and other (RFM-based?) transceivers. So if possible, also make a test with 2.3.2 and nRF24.
Problem may be related to the change from soft ACK to ECHO (https://github.com/mysensors/MySensors/releases).

karlheinz2000

All tests are done with nRF24 radio only.

rejoe2

Thx, so this seems not to be the reason behind that.
Sth. else: If possible, it could be a good idea to add some more content to the thread title (ECHO in 2.3.2 changes message content)?

frits

the library differs the way it sends empty V_TEXT messages between 2.2.0 and 2.3.2.

2.2.0
10:25:06.047 -> 73639 TSF:MSG:SEND,0-0-70-70,s=0,c=1,t=47,pt=0,l=0,sg=0,ft=0,st=OK:

note: length = 0, payload type = 0

2.3.2

10:30:45.718 -> 22550 TSF:MSG:SEND,0-0-70-70,s=0,c=1,t=47,pt=1,l=1,sg=0,ft=0,st=OK:0

note: length = 1, payload type = 1

frits

I think the issue found it's way into the library here:
https://github.com/mysensors/MySensors/commit/74e566f5602261ba58e9a7fb06357810ae793b0b#diff-75e571c3ad1b2847e816b36b077fb7306d69ac8386b59d600a265f12bee1f8ba

old code:

	// payload
	if (command == C_STREAM) {
		uint8_t bvalue[MAX_PAYLOAD_SIZE];
		uint8_t blen = 0;

new code:

	// payload
	if (str == NULL) {
		// no payload, set default value
		message.set((uint8_t)0);
	} else if (command == C_STREAM) {
		// stream payload

if there's no payload, the library assumes uint8_t with value 0

rejoe2

@frits: Thx for analyzing this issue. Atm I honestly don't have no clue how to deal with this change in the FHEM module code. When analyzing ECHO, there's a check weather send info is identical to what's been sent.
So the only way out seems to be less exact and also let be 0 the same as "nothing" (Perl doesn't use NULL).

@karlheinz2000 Perhaps, we could ad a small if statement at the end of line 760 to treat 0 as "nothing" or undef?

or $_->{payload} ne $msg->{payload} if $msg->{payload}

Deleting the entire line might cause problems...

karlheinz2000

I've opened an issue for that.
https://github.com/mysensors/MySensors/issues/1452

According to API payload is same on ECHO message.
I feel this should be handled/fixed in lib, but I have no idea how to do...
If it is not possible to fix in lib, it shall not be allowed to send message with no payload anymore, which controller has to make sure then.
@rejoe2
Regarding FHEM, at the moment we should keep it as it is. No payload is not the normal use case.
I flashed gateway with 2.2.0 and this fixed the problem for me.

ECHO problems when sending with no payload

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ECHO problems when sending with no payload

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