Hi everyone!
Was " happy" the owner of the board RB912 and modem Huawei EM820W.
First tried to run the modem onboard RB912 with Router OS v5.26. The modem does not running up. Then changed the type of USB to MiniPCIe (in ROS v5.26 this can only be done via the command line), but appeared usb1 port shown as inactive and therefore modem cannot run.
After upgrading to ROS v6.6 modem was found out, great speed , great stability as it seemed initially, but after a few hours became a modem hang up. Sometimes it helps to restart ROS by the script, sometimes helps only a full power off for a few seconds.
Recently discovered that the modem hangs up immediately at the moment when built-in WiFi module heavily loaded (or may be loaded CPU).
I thought that this may be due to interference from radio transmitter and tried to put the antenna far from router and lower transmitter power to a minimum, but it did not lead to positive results. Then I connected the USB modem Huawei E1820 instead MiniPCIe (with RB411 it worked very stable), but the above bug repeated itself in this case with RB912 board.
Then I found in the compatibility list that I need to keep info channel open. Added a script that runs every 10 seconds and takes info channel oppen but no any positive results.
Then added a script that disables power USB (MiniPCIe) for 10 sec. but this does not always help. Rebooting does not always help too. I generally inclined to think that when the modem hangs up then hangs not only it - sometimes stops working even planner and stops running scripts.
Also I tried to configure the modem that it worked only as a modem (no additional features) and only in the 3G (HSPA) mode - also no positive result.
I have several boards RB912 and modems Huawei EM820W, all symptoms are present on different hardware. I am very upset and I doubt that the developers do not ignore me and other users with similar problems.
So I want to ask if they have someone to set up a positive experience with a particular model of MiniPCIe modem with RB912 board? It is desirable that it was a fast modem (with support for HSPA +).