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| @igorpc I found built-in wifi not reliable (OPI 2), see simple ping results:
 
 Copy code$ ping opi
PING opi (192.168.5.6) 56(84) bytes of data.
64 bytes from opi.lan (192.168.5.6): icmp_seq=1 ttl=64 time=181 ms
64 bytes from opi.lan (192.168.5.6): icmp_seq=2 ttl=64 time=298 ms
64 bytes from opi.lan (192.168.5.6): icmp_seq=3 ttl=64 time=1.36 ms
64 bytes from opi.lan (192.168.5.6): icmp_seq=4 ttl=64 time=342 ms
64 bytes from opi.lan (192.168.5.6): icmp_seq=5 ttl=64 time=1.34 ms
64 bytes from opi.lan (192.168.5.6): icmp_seq=6 ttl=64 time=183 ms
64 bytes from opi.lan (192.168.5.6): icmp_seq=7 ttl=64 time=1.35 ms
64 bytes from opi.lan (192.168.5.6): icmp_seq=8 ttl=64 time=1.42 ms
64 bytes from opi.lan (192.168.5.6): icmp_seq=9 ttl=64 time=1.38 ms
64 bytes from opi.lan (192.168.5.6): icmp_seq=10 ttl=64 time=273 ms
64 bytes from opi.lan (192.168.5.6): icmp_seq=11 ttl=64 time=1.42 ms
64 bytes from opi.lan (192.168.5.6): icmp_seq=12 ttl=64 time=318 ms
[...cut!...]
--- opi ping statistics ---
132 packets transmitted, 132 received, 0% packet loss, time 131185ms
<font color="#ff0000">rtt min/avg/max/mdev = 1.286/109.338/868.235/137.288 ms</font>
 Wifi disconnects from time to time, see syslog and dmesg:
 
 Copy codeFeb 26 09:03:41 opi wpa_supplicant[380]: wlan0: WPA: Group rekeying completed with 64:70:02:67:60:33 [GTK=TKIP]
Feb 26 09:13:40 opi wpa_supplicant[380]: wlan0: WPA: Group rekeying completed with 64:70:02:67:60:33 [GTK=TKIP]
Feb 26 09:23:40 opi wpa_supplicant[380]: wlan0: WPA: Group rekeying completed with 64:70:02:67:60:33 [GTK=TKIP]
Feb 26 09:33:40 opi wpa_supplicant[380]: wlan0: WPA: Group rekeying completed with 64:70:02:67:60:33 [GTK=TKIP]
Feb 26 09:43:41 opi wpa_supplicant[380]: wlan0: WPA: Group rekeying completed with 64:70:02:67:60:33 [GTK=TKIP]
Feb 26 09:53:41 opi wpa_supplicant[380]: wlan0: WPA: Group rekeying completed with 64:70:02:67:60:33 [GTK=TKIP]
Feb 26 10:03:40 opi wpa_supplicant[380]: wlan0: WPA: Group rekeying completed with 64:70:02:67:60:33 [GTK=TKIP]
[Fri Feb 26 09:03:41 2016] RTL871X: send eapol packet
[Fri Feb 26 09:03:41 2016] RTL871X: set group key camid:5, addr:64:70:02:67:60:33, kid:1, type:TKIP
[Fri Feb 26 09:13:40 2016] RTL871X: send eapol packet
[Fri Feb 26 09:13:40 2016] RTL871X: set group key camid:6, addr:64:70:02:67:60:33, kid:2, type:TKIP
[Fri Feb 26 09:23:40 2016] RTL871X: send eapol packet
[Fri Feb 26 09:23:40 2016] RTL871X: set group key camid:5, addr:64:70:02:67:60:33, kid:1, type:TKIP
[Fri Feb 26 09:33:40 2016] RTL871X: send eapol packet
[Fri Feb 26 09:33:40 2016] RTL871X: set group key camid:6, addr:64:70:02:67:60:33, kid:2, type:TKIP
[Fri Feb 26 09:43:40 2016] RTL871X: send eapol packet
[Fri Feb 26 09:43:40 2016] RTL871X: set group key camid:5, addr:64:70:02:67:60:33, kid:1, type:TKIP
[Fri Feb 26 09:53:40 2016] RTL871X: send eapol packet
[Fri Feb 26 09:53:40 2016] RTL871X: set group key camid:6, addr:64:70:02:67:60:33, kid:2, type:TKIP
[Fri Feb 26 10:03:40 2016] RTL871X: send eapol packet
[Fri Feb 26 10:03:40 2016] RTL871X: set group key camid:5, addr:64:70:02:67:60:33, kid:1, type:TKIP
 Some workaround is having network traffic, i.e. continous ping in screen. Then wifi is looks better I think:
 
 Copy code--- opi ping statistics ---
733 packets transmitted, 733 received, 0% packet loss, time 732988ms
<font color="#2e8b57">rtt min/avg/max/mdev = 1.152/18.216/938.857/77.553 ms</font>
 
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