# How to link microhard pDDL? Source: https://forum.modalai.com/topic/209/how-to-link-microhard-pddl Category: General Questions (https://forum.modalai.com/category/2/general-questions) Posted: 2021-04-24 22:34:18 UTC by shlee853 Replies: 3 · Views: 664 ## shlee853 · 2021-04-24 22:34:18 UTC Hi Dev, I'm testing microhard pDDL module. I read all manual and did it. Here is IP for VOXL. eth0 Link encap:Ethernet HWaddr DA:2C:5D:18:7B:6F inet addr:192.168.168.100 Bcast:0.0.0.0 Mask:255.255.255.0 inet6 addr: fe80::d82c:5dff:fe18:7b6f/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:156 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:8196 (8.0 KiB) Here is IP for HOST enp0s20u4u1: flags=4163 mtu 1500 inet 192.168.168.152 netmask 255.255.255.0 broadcast 192.168.168.255 inet6 fe80::b25c:13b3:5c33:9e6 prefixlen 64 scopeid 0x20 ether 9e:2c:f3:a6:2b:76 txqueuelen 1000 (Ethernet) RX packets 42 bytes 6607 (6.6 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 78 bytes 10752 (10.7 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 enp0s20u4u2: flags=4163 mtu 1500 inet 192.168.168.237 netmask 255.255.255.0 broadcast 192.168.168.255 inet6 fe80::dc90:2e27:ecc3:21b8 prefixlen 64 scopeid 0x20 ether 66:af:0d:e7:31:7d txqueuelen 1000 (Ethernet) RX packets 413 bytes 29899 (29.8 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 472 bytes 66478 (66.4 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 But, I cannot access each other. I checked ping each other IP. I think I have to link mater and slave. I refer to manual for link and powered same time with reset button as like this. https://docs.modalai.com/microhard-add-on-manual/ But, IP is not initialized 192.168.168.1 or 2 also, pDDL module was blinking tx only. RX LED is alway on. Could you please send me video for pDDL LINK procedure if you have? Thanks, ## Reply by shlee853 · 2021-04-26 13:09:10 UTC @shlee853 Hi, Here is my HOST swift@swift-HP-Pavilion-dv6-Notebook-PC:~$ ifconfig eno1: flags=4099 mtu 1500 ether a0:b3:cc:52:14:b8 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 enp0s20u4u1: flags=4163 mtu 1500 inet 192.168.168.152 netmask 255.255.255.0 broadcast 192.168.168.255 inet6 fe80::471c:500f:28c7:3d86 prefixlen 64 scopeid 0x20 ether 9e:2c:f3:a6:2b:76 txqueuelen 1000 (Ethernet) RX packets 41 bytes 6279 (6.2 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 81 bytes 10981 (10.9 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 enp0s20u4u2: flags=4163 mtu 1500 inet 192.168.168.237 netmask 255.255.255.0 broadcast 192.168.168.255 inet6 fe80::2fc7:c2e8:d5e0:a059 prefixlen 64 scopeid 0x20 ether 66:af:0d:e7:31:7d txqueuelen 1000 (Ethernet) RX packets 202 bytes 16855 (16.8 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 219 bytes 32282 (32.2 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73 mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1000 (Local Loopback) RX packets 4858 bytes 457898 (457.8 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 4858 bytes 457898 (457.8 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 wlo1: flags=4163 mtu 1500 inet 192.168.219.182 netmask 255.255.255.0 broadcast 192.168.219.255 inet6 fe80::6fd6:734f:3553:baf4 prefixlen 64 scopeid 0x20 ether 60:6c:66:81:e7:19 txqueuelen 1000 (Ethernet) RX packets 208551 bytes 118036955 (118.0 MB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 49693 bytes 5838784 (5.8 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 swift@swift-HP-Pavilion-dv6-Notebook-PC:~$ Here is my VOXL yocto:/# ifconfig eth0 Link encap:Ethernet HWaddr B6:B4:A2:53:47:47 inet addr:192.168.168.100 Bcast:0.0.0.0 Mask:255.255.255.0 inet6 addr: fe80::b4b4:a2ff:fe53:4747/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2 errors:0 dropped:0 overruns:0 frame:0 TX packets:21 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:92 (92.0 B) TX bytes:1342 (1.3 KiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:47188 errors:0 dropped:0 overruns:0 frame:0 TX packets:47188 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:5046771 (4.8 MiB) TX bytes:5046771 (4.8 MiB) wlan0 Link encap:Ethernet HWaddr EC:5C:68:CD:25:A1 inet addr:192.168.8.1 Bcast:192.168.8.255 Mask:255.255.255.0 inet6 addr: fe80::ee5c:68ff:fecd:25a1/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:78 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3000 RX bytes:0 (0.0 B) TX bytes:3644 (3.5 KiB) yocto:/# ping 192.168.168.152 PING 192.168.168.152 (192.168.168.152) 56(84) bytes of data. From 192.168.168.100 icmp_seq=1 Destination Host Unreachable From 192.168.168.100 icmp_seq=2 Destination Host Unreachable From 192.168.168.100 icmp_seq=3 Destination Host Unreachable From 192.168.168.100 icmp_seq=4 Destination Host Unreachable From 192.168.168.100 icmp_seq=5 Destination Host Unreachable From 192.168.168.100 icmp_seq=6 Destination Host Unreachable From 192.168.168.100 icmp_seq=7 Destination Host Unreachable From 192.168.168.100 icmp_seq=8 Destination Host Unreachable From 192.168.168.100 icmp_seq=9 Destination Host Unreachable From 192.168.168.100 icmp_seq=10 Destination Host Unreachable From 192.168.168.100 icmp_seq=11 Destination Host Unreachable From 192.168.168.100 icmp_seq=12 Destination Host Unreachable ^C --- 192.168.168.152 ping statistics --- 13 packets transmitted, 0 received, +12 errors, 100% packet loss, time 12014ms pipe 3 I cannot reach to my HOST from VOXL. Could you please give me advice? Thanks ## Reply by tom (ModalAI staff) · 2021-04-26 16:44:10 UTC @shlee853 In order for the two Microhard modules to communicate with eachother, one needs to be configure as a "Master" and one needs to be configured as a "Slave". Our recommended configuration is to have the "Master" module on the VOXL and the "Slave" module on the host computer side. The easiest way to check whether they are configured correctly as Master / Slave is to ADB onto VOXL and attempt to `ping 192.168.168.1`. If that is succesful, then you know that the Microhard module on VOXL was configured correctly as Master. You can do the same on the host PC side to check the Slave module `ping 192.168.168.2`. It is likely that one of these two modules has not been configured correctly. ## Reply by manzur · 2021-05-20 19:36:30 UTC We have the same issue here with the Microhard pairing as posted in this https://forum.modalai.com/topic/251/issue-in-microhard-paring-with-slave-unit. We also tried to follow the instruction but its not paring.