NTRIP Caster not working

[ralphkink]

Problem: esp32-xbee in caster mode does not sent valid messages and crashes the module after some time.

Setup:

• Ardusimple XBEE, running firmware v0.5.4
• XBEE configured as NTRIP caster on local WiFi (placed directly next to access point)
• GNSS board: simpleRTK2B-F9P V3, configured as base station with ublox config file

Clients:
I've tried two different NTRIP clients:

• BKG Ntrip Client Version 2.12.17 (only NTRIP v1 seems to be able to connect to XBEE)
• u-center 21.05 NTRIP Client function
• I've only used the clients for testing in sequence, never both at the same time

Symptoms:

• After inital connect, both clients are able to retrive the name of the mountpoint
• u-center initially report a "green" connect of the client but seems to receive incomplete data and reports a connection error 10035
• BKG client reports a error on connect attempt
• After some minutes, the ESP32 XBee Config web page "degenerates" - it sill loads but it seem CSS files are missing. Anyway, something is going south on the ESP
• After some more minutes, the ESP becomes unresponse (cannot access via HTTP anymore, NTRIP clients report "disconnect"
• The symptoms can be reproduced 100% of attempts

Is this a know bug? Anything I can do on my end?
Big thanks in advance for any help provided!

Additional information / Attachments: (see below)

• u-center NTRIP log file
• screen shot from BKG client connection attempt
• screen shot from corrupted web page

--- u-center log file ---
10:02:33 Send mountpoint request (base)
10:02:33 Data received from server (15bytes).
10:02:55 Ending NTRIP session.
10:02:55 Closing connection to server.
10:02:58 Connection error received (10035).
10:02:58 Server connection closed.
10:06:24 Ending NTRIP session.
10:06:24 NTRIP session already closed.
10:06:24 Start NTRIP session.
10:06:24 Connected to NTRIP server.
10:06:24 Send mountpoint request ()
10:06:24 Data received from server (184bytes).
10:06:24 Connection error received (0).
10:06:24 Ending NTRIP session.
10:06:24 Closing connection to server.
10:06:24 Server connection closed.
10:06:27 Start NTRIP session.
10:06:27 Connected to NTRIP server.
10:06:27 Send mountpoint request (base)
10:06:27 Data received from server (15bytes).

--- XBEE web site ---

--- BKG Ntrip Client output on connection to mount point ---

[ralphkink]

Meanwhile, I was able to solve the problem, but would still consider this a bug (or at least room for improvement) for
esp32-xbee. Root cause was:

• In UBX-CFG-PRT "Protocol Out" was (correctly) set to "5 - RTCM3" for UART2
• BUT, in UBX-CFG-MSG the RTCM3.3 message were disabled for UART2

So the esp32-xbee did not receive any data from the ZED-FP9, and hence the Caster did not send any data (or incomplete data?). This is causing the u-center NTRIP clients to do disconnects and new connection requests over and over again. 

As far as I can tell, the repeated connects/disconnects seem to destabilize the esp32-xbee, eventually leading to a crash after about 15mins.