The issue of Steve's Get Diagnostics request being interrupted when uploading diagnostics.log was interrupted.

[GZ-Metal-Cell]

The issue of Steve's "Get Diagnostics" request being interrupted during the upload of diagnostics.log being processed.

I built a simple FTP server using python:

# ftp_server.py
from pyftpdlib.authorizers import DummyAuthorizer
from pyftpdlib.handlers import TLS_FTPHandler, FTPHandler
from pyftpdlib.servers import FTPServer
import os

authorizer = DummyAuthorizer()
authorizer.add_anonymous(os.getcwd(), perm="elradfmw")
authorizer.add_user("test", "test", os.getcwd(), perm="elradfmw")

handler = FTPHandler
handler.authorizer = authorizer

address = ("0.0.0.0", 21)
server = FTPServer(address, handler) server.serve_forever()

After Steve sends the Get Diagnostics request, the client displays:

[MO] Recv: [2,"0efec649-021a-4816-b0f5-338aa91f5988","GetDiagnostics",{"location":"ftp://test:test@192.168.2.71/"}]

[MO] info (DiagnosticsService.cpp:173): Scheduled Diagnostics upload!

location = ftp://test:test@192.168.2.71/diagnostics.log

retries = 1, retryInterval = 180 startTime = 1970-01-01T00:00:00Z

stopTime = 2027-02-06T05:33:58Z
[MO] debug (DiagnosticsService.cpp:185): Initial try at 2026-02-06T05:34:03Z
[MO] Send: [3,"0efec649-021a-4816-b0f5-338aa91f5988",{"fileName":"diagnostics.log"}]
[MO] debug (DiagnosticsService.cpp:66): Call onUpload
[MO] debug (DiagnosticsService.cpp:376): discovered 8 files
[MO] debug (FtpMbedTLS.cpp:508): init upload ftp://test:test@192.168.2.71/diagnostics.log
[MO] debug (FtpMbedTLS.cpp:833): parsed dir: ; fname: diagnostics.log
[MO] debug (FtpMbedTLS.cpp:858): parsed user: test; pass: te***
[MO] debug (FtpMbedTLS.cpp:875): parsed host: 192.168.2.71; port: 21
[MO] debug (FtpMbedTLS.cpp:578): RECV: 220 pyftpdlib 2.1.0 ready.
[MO] debug (FtpMbedTLS.cpp:612): select user test
[MO] debug (FtpMbedTLS.cpp:433): SEND: USER test
[MO] debug (FtpMbedTLS.cpp:578): RECV: 331 Username ok, send password.
[MO] debug (FtpMbedTLS.cpp:615): enter pass te***
[MO] debug (FtpMbedTLS.cpp:433): SEND: PASS ***
[MO] Send: [2,"1d976162-d4d0-4756-9d80-0f32d4a4b88a","DiagnosticsStatusNotification",{"status":"Uploading"}]
[MO] debug (FtpMbedTLS.cpp:578): RECV: 230 Login successful.
[MO] debug (FtpMbedTLS.cpp:618): select directory /
[MO] debug (FtpMbedTLS.cpp:433): SEND: CWD /
[MO] debug (FtpMbedTLS.cpp:578): RECV: 250 "/" is the current directory.
[MO] debug (FtpMbedTLS.cpp:621): enter passive mode
[MO] debug (FtpMbedTLS.cpp:433): SEND: PASV
[MO] debug (FtpMbedTLS.cpp:578): RECV: 227 Entering passive mode (192,168,2,71,207,22).
[MO] debug (FtpMbedTLS.cpp:647): request upload for diagnostics.log
[MO] debug (FtpMbedTLS.cpp:433): SEND: STOR diagnostics.log
[MO] debug (FtpMbedTLS.cpp:578): RECV: 125 Data connection already open. Transfer starting.
[MO] debug (FtpMbedTLS.cpp:657): data connection accepted
[MO] debug (DiagnosticsService.cpp:458): upload diag chunk (513B)
[MO] Recv: [3,"1d976162-d4d0-4756-9d80-0f32d4a4b88a",{}]
[MO] ERROR (FtpMbedTLS.cpp:552): FTP transfer aborted
[MO] debug (DiagnosticsService.cpp:458): upload diag chunk (513B)
[MO] debug (DiagnosticsService.cpp:458): upload diag chunk (513B)
[MO] ERROR (FtpMbedTLS.cpp:766): mbedtls_ssl_write: -78
[MO] debug (FtpMbedTLS.cpp:372): closing data conn
[MO] info (DiagnosticsService.cpp:466): FTP upload failure (2)
[MO] debug (FtpMbedTLS.cpp:433): SEND: QUIT

[MO] ERROR (FtpMbedTLS.cpp:453): fatal - message on ctrl channel lost: 0,

[MO] warning (DiagnosticsService.cpp:99): Upload timeout or failed

[MO] debug (DiagnosticsService.cpp:112): end upload routine (no more retry)

[MO] Send: [2,"714b7c93-9302-4a1f-b52c-b1aa59fc2ee2","DiagnosticsStatusNotification",{"status":"UploadFailed"}]

[MO] Recv: [3,"714b7c93-9302-4a1f-b52c-b1aa59fc2ee2",{}]

At this point, the server will only receive the truncated diagnostics.log:

### AET1P22-BKLW4CS-7kw Hardware Diagnostics - v. V0.0.1
2026-02-06T05:34:03Z

#OCPP
client_version=1.2.0
uptime=47s
ocpp_status_cId0=Available
ocpp_status_cId1=Available
ws_status=connected
ws_last_conn=22s
ws_last_recv=43s
cId1_hasTx=0
ENABLE_CONNECTOR_LOCK=0
ENABLE_FILE_INDEX=0
ENABLE_V201=0

# Filesystem
ws-conn.jsn
system-params.jsn
client-state.jsn
reservations.jsn
test.txt
test.bin
bootstats.jsn
ocpp-config.jsn


# File ocpp-config.jsn:
{"head":{"content-type":"ocpp_config_file","version":"2.0"},"con

The server log is:

[I 2026-02-06 13:33:43] concurrency model: async
[I 2026-02-06 13:33:43] masquerade (NAT) address: None
[I 2026-02-06 13:33:43] passive ports: None
[I 2026-02-06 13:33:43] >>> starting FTP server on 0.0.0.0:21, pid=37516 <<<
[I 2026-02-06 13:34:04] 192.168.2.72:57805-[] FTP session opened (connect)
[I 2026-02-06 13:34:04] 192.168.2.72:57805-[test] USER 'test' logged in.
[I 2026-02-06 13:34:04] 192.168.2.72:57805-[test] CWD D:\Users\Documents\TPV\Codes\Python\ftp 250
[I 2026-02-06 13:34:05] 192.168.2.72:57805-[test] STOR D:\XXX\diagnostics.log completed=0 bytes=513 seconds=1.126

[I 2026-02-06 13:34:05] 192.168.2.72:57805-[test] FTP session closed (disconnect).


I don't quite understand why the log upload was interrupted. Could you please provide some guidance?