Peer to peer mode: Connect command not found

[Simon Morrison]

I have two mDots, one connected to the UDK and the other to a USB/Serial Convertor. I updated their firmware to V3 but when I could not get peer to peer to work I loaded 2.0.16-1. I followed the example in the AT command manual (same sequence is shown on the web site) except the example is for a US unit. Instead I used AT+TXDR=6 at which point it started to work. I then just exchanged a little bit of data a few characters at a time using RealTerm at both ends.

They stayed connected for two days and just now I found that unit 1 still received data from unit 2, but unit 2 did not receive from unit 1. It also started echoing data I entered back to the screen.

I typed +++ at both ends which disconnected them. Now they both won’t recognise the CONNECT command and say “Command Not Found!”. I tried power cycling and using ATZ but that made no difference.

Any ideas?

Device ID:	     	       00:80:00:00:00:00:a1:c3
                               
Frequency Band:	        	       EU868
                                         
Frequency Sub Band:	    0
                                                     
Public Network:	        	       off
                                           
Start Up Mode:	 	       COMMAND
                                               
Network Address:	       00112233
                                              
Network ID:	    	       2b:7e:15:16:28:ae:d2:a5
                               
Network ID Passphrase:	 
                                                      
Network Key:	   	       2b.7e.15.16.28.ae.d2.a6.ab.f7.15.88.09.cf.4f.45
       
Network Key Passphrase:	        
                                              
Network Session Key:	   00.11.22.33.00.11.22.33.00.11.22.33.00.11.22.33
       
Data Session Key:	      33.22.11.00.33.22.11.00.33.22.11.00.33.22.11.00
       
Network Join Mode:	     PEER_TO_PEER
                                          
Network Join Retries:	  2
                                                     
Preserve Session:	      off
                                                   
Join Byte Order:	       LSB
                                                   
Join Delay:	    	       1
                                                     
Join Rx1 DR Offset:	    0
                                                     
Join Rx2 Datarate:	     DR0 - SF12BW125
                                       
Join Rx2 Frequency:	    869525000
                                             
App Port:	      	       1
                                                     
Link Check Threshold:	  off
                                                   
Link Check Count:	      off
                                                   
Error Correction:	      1 bytes
                                               
ACK Retries:	   	       off
                                                   
Packet Repeat:	 	       1
                                                     
Encryption:	    	       on
                                                    
CRC:	   	       	       on
                                                    
Adaptive Data Rate:	    off
                                                   
Command Echo:	  	       on
                                                    
Verbose Response:	      off
                                                   
Tx Frequency:	  	       0
                                                     
Tx Data Rate:	  	       DR6 - SF7BW250
                                        
Tx Power:	      	       11
                                                    
Tx Antenna Gain:	       3
                                                     
Tx Wait:	       	       on
                                                    
Tx Inverted Signal:	    off
                                                   
Rx Delay:	      	       1 s
                                                   
Rx Inverted Signal:	    on
                                                    
Rx Output Style:	       HEXADECIMAL
                                           
Debug Baud Rate:	       115200
                                                
Serial Baud Rate:	      115200
                                                
Serial Flow Control:	   off
                                                   
Serial Clear On Error:	 on
                                                    
Wake Mode:	     	       INTERVAL
                                              
Wake Interval:	 	       10 s
                                                  
Wake Delay:	    	       100 ms
                                                
Wake Timeout:	  	       20 ms
                                                 
Wake Pin:	      	       DI8
                                                   
Log Level:	     	       0

OK

[Martin Pelletier]

Hi Simon,
Tx frequency is 0!! ->AT+TXF=your frequency. I believe if you dont have the right frequency for your mdot, it will not support it!! Check the model description just to be sure.

Other thing the mdot library has to follow the mbed-os
ie lib mdot 3.0 for mbed-os 5.4.7 (otherwise you could get some weird behavior)

regards,
Martin

[Simon Morrison]

Thanks, it is working again 🙂

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