TRB142 Serial Over IP still does not work

[David42]

The Serial Over IP bugs continues.

TRB142 - Serial Over IP no reconnection

Hello. I just received a TRB142 and I’m trying to use Serial Over IP in TCP Client mode. It works at its first connection, however if the receiving socket is closed, the gateway does not seem to try reconnecting. How the Reconnection time and the Inactivity timeout are supposed to work? I did not change their default values.

TRB142 Serial over IP Reconnect Bug not fixed

Firmware version TRB1_R_00.07.08_WEBUI.bin Serial Over IP works first time. Now the firmware reconnects, but there is something fundamentally different about the connection. It repeats “\r+QCSQ: “LTE”,79,-113,133,-12” and is unresponsive to all data send to the TCP connection (including ‘AT+QCSQ=0\r\n’). This includes the Serial → Over IP page showing 0 received bytes. Turning on and off the Serial → Over IP service fixes things. Perhaps leave this topic open for more than 15 days!

https :// community.teltonika.lt/t/serial-over-ip-reconnect-bugfix/6583

The bug is claimed to be fixed, but persists in 00.07.08.2 and 00.07.09.1
As far as I can tell Serial Over IP has not worked since firmware 00.07.06.2

We are using the client mode. With more recent firmwares, a connection is
established the remote host, but we see data like:
+QCSQ: “LTE”,58,-92,164,-14
+QCSQ: “WCDMA”,77,-77,-12
+CGREG: 5,“1050”,“0EBA631”,2

And there is no two-way communication to the serial port.

Turning on and off the Serial Over IP configuration makes things work again,
but manual intervention is not possible for large-scale deployments.

[hrtx]

Could you check 7.7.3 FW?

[David42]

00.07.07.3 fails to reconnect.

The keepalive parameters appear ineffective and the Serial → Over IP even claims to be up even over a full TRB142 reboot. Restarting the mobile connection has no effect.

At least more recent firmwares appear to re-establish TCP client connections - it’s just that it’s no longer connected to the serial port.

[dagado]

Hi. I also have the same problem with a TRB145.
The problem may be that it is not available to do the redirection until it lifts the mobile connection.
My solution has been to add a line, almost at the end of the file /etc/hotplug.d/iface/89-gsm-event

    if [ "$ACTION" = "ifup" ] && [ "$iface" -gt 0 ]; then
        [ "$(echo "$UP_IFACES" | wc -l)" -gt 1 ] && {
            UPTIME="$(get_uptime $INTERFACE)"
            for i in $UP_IFACES; do
                [ "$INTERFACE" = "$i" ] && continue
                # Skip logging if its not the first connected iface
                [ "$(get_uptime $i)" -gt "$UPTIME" ] && return 0
            done
        }

        mdm_ubus_obj="$(find_mdm_ubus_obj "$MODEM")"
        get_operator
        get_contype
        log "Mobile Data" "Mobile data connected ($MODEM_TYPE modem)"
        log "Network Type" "Joined $CONTYPE network ($MODEM_TYPE modem)"
        log "Network Operator" "Connected to $OPERATOR operator ($MODEM_TYPE modem)"
       /etc/init.d/rs_overip restart  <------------- THIS LINE
    elif [ "$ACTION" = "ifdown" ] && [ "$UP_IFACES" = "" ]; then
        log "Mobile Data" "Mobile data disconnected ($MODEM_TYPE modem)"
    fi