Hi
We are using RB951G-2HnD with 3G USB modem Huawei. PPP connection to internet is established via serial channel 0. So far this is working well.
Channel 1 of USB modem is “converted” to TCP by internal remote-access feature.
port remote-access print
Flags: X - disabled, I - inactive, A - active, B - busy, L - logging-active
# PORT CHANNEL PROTOCOL TCP-PORT ALLOWED-ADDRESSES LOCAL-ADDRESS
0 usb1 1 raw 44 0.0.0.0/0
My problem is remote-access is accepting more than one connection to one serial port!
First connection can talk with modem (send AT, receive OK), but second can not.
In my opinion, remote-access feature should actively reject any other connection.
Our embedded device connects to remote port and talks with 3G modem and sends SMS on its own. This works, but…
When I reset our device, ongoing TCP connection is still established and our device creates new one. In new connection, communication with modem is not possible.
For example Lantronix serial port redirector accepts only one connection at time, actively refusing any other and there is an timeout for connection based on data throughput.