# MYGCS Heartbeat lost - Fiber Optic Cable **URL:** \ **Category:** Blue Robotics Vehicles\ **Tags:** cockpit\ **Created:** [July 23, 2026, 7:48pm UTC](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376 "2026-07-23T19:48:42Z")\ **Posts on this page:** 14\ **Page:** 2
**Author:** ![minskim88](https://avatars.discourse-cdn.com/v4/letter/m/9de0a6/32.png) [@minskim88](https://discuss.bluerobotics.com/u/minskim88)\ **Post date:** [July 31, 2026, 5:39pm UTC](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376/21 "2026-07-31T17:39:26Z")
Hi Tony, Not really finding the time to go out after the last one. But here is at least a bench testing that I can give you. 1. With Cerulean DVL extension ON (including rangefinder). [cockpit-mavlink-dump-2026-07-31T17-32-33-542Z.jsonl](https://discuss.bluerobotics.com/uploads/short-url/zzJvSOnDbnbh1LDFGvZzK5Ceqgr.jsonl) (3.2 MB) [cockpit-mavlink-dump-2026-07-31T17-30-20-287Z.jsonl](https://discuss.bluerobotics.com/uploads/short-url/8Unp0y68i9070LI1nowsbk2760T.jsonl) (3.7 MB) 1. With Cerulean DVL extension OFF. [cockpit-mavlink-dump-2026-07-31T17-28-32-467Z.jsonl](https://discuss.bluerobotics.com/uploads/short-url/gdjzYrPkBiNsFdPcK8HLTKjQ4ih.jsonl) (2.0 MB) Here is also the logs. [00417-2026-07-31\_17-19-42.tlog](https://discuss.bluerobotics.com/uploads/short-url/vC064QyTPFGarQOg1uPq8100buf.tlog) (6.1 MB) [Cockpit (Jul 31, 2026 - 10꞉26꞉43 GMT-7).syslog](https://discuss.bluerobotics.com/uploads/short-url/wIX5UXujKxXaFUbyxYY9uOlLdMy.syslog) (88.3 KB) [00000119.BIN](https://discuss.bluerobotics.com/uploads/short-url/8A6HcUIyWsksrBx1QszUEebfGA7.BIN) (2.1 MB) I will post again with actual data from the dive. Thank you, ---
**Author:** ![tony-white](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/tony-white/32/13297_2.png) [@tony-white](https://discuss.bluerobotics.com/u/tony-white)\ **Post date:** [July 31, 2026, 8:56pm UTC](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376/22 "2026-07-31T20:56:53Z")
Hi @minskim88 We’re testing to see if the issues you’re having are related to the problems found in this [pull request](https://github.com/ArduPilot/ardupilot/pull/33828). Assuming you’re using standard 32bit BlueOS, this ArduSub firmware file attached here can be flashed from file under autopilot firmware. [ardusub\_udpfix\_32bits](https://discuss.bluerobotics.com/uploads/short-url/cua5XgTJmvoQ3VbOdiIRl2Szh67) (2.2 MB) In order to upload it I added a .txt extension, remove this before selecting it to flash! Please let us know if this changes your results ---
**Author:** ![minskim88](https://avatars.discourse-cdn.com/v4/letter/m/9de0a6/32.png) [@minskim88](https://discuss.bluerobotics.com/u/minskim88)\ **Post date:** [July 31, 2026, 10:03pm UTC](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376/23 "2026-07-31T22:03:01Z")
Ok will give a go. Will report once done ---
**Author:** ![3dMB](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/3dmb/32/13905_2.png) [@3dMB](https://discuss.bluerobotics.com/u/3dMB)\ **Post date:** [August 2, 2026, 6:15am UTC](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376/24 "2026-08-02T06:15:25Z")
I had similar issues last year, as per this thread [Cockpit stops working when DVL is active - #9 by 3dMB](https://discuss.bluerobotics.com/t/cockpit-stops-working-when-dvl-is-active/19021/9) Since using only sonarview, I have not had issues ---
**Author:** ![minskim88](https://avatars.discourse-cdn.com/v4/letter/m/9de0a6/32.png) [@minskim88](https://discuss.bluerobotics.com/u/minskim88)\ **Post date:** [August 2, 2026, 5:07pm UTC](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376/25 "2026-08-02T17:07:51Z")
Thank you @3dMB, for the thread. I dont think DVL-75 is compatible with Sonarview, hence I need the extension to send Vision\_Position\_Delta to mavlink2rest. Havent had the time to flash the ardusub @tony-white , but it looks like “.txt” was not added? All my other files show an extension for file type but except the ardusub\_udpfix\_32bits ![image](https://us1.discourse-cdn.com/flex019/uploads/bluerobotics/original/3X/9/b/9b47772aa31fc432b097284e647b31b6df8a8bab.png) ---
**Author:** ![tony-white](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/tony-white/32/13297_2.png) [@tony-white](https://discuss.bluerobotics.com/u/tony-white)\ **Post date:** [August 2, 2026, 5:31pm UTC](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376/26 "2026-08-02T17:31:04Z")
Hi @minskim88 - That’s strange, does the extension show when you go to file properties? When you go to flash if you have issues definitely investigate the file extension… ---
**Author:** ![minskim88](https://avatars.discourse-cdn.com/v4/letter/m/9de0a6/32.png) [@minskim88](https://discuss.bluerobotics.com/u/minskim88)\ **Post date:** [August 3, 2026, 11:20pm UTC](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376/27 "2026-08-03T23:20:09Z")
Just shows up as “file” ![image](https://us1.discourse-cdn.com/flex019/uploads/bluerobotics/original/3X/8/e/8e34cc50d51bf4164bd01d88bcc99a218f8627d0.png) ---
**Author:** ![tony-white](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/tony-white/32/13297_2.png) [@tony-white](https://discuss.bluerobotics.com/u/tony-white)\ **Post date:** [August 3, 2026, 11:43pm UTC](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376/28 "2026-08-03T23:43:20Z")
Ok, does it flash ok? ---
**Author:** ![minskim88](https://avatars.discourse-cdn.com/v4/letter/m/9de0a6/32.png) [@minskim88](https://discuss.bluerobotics.com/u/minskim88)\ **Post date:** [August 4, 2026, 9:56pm UTC](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376/29 "2026-08-04T21:56:18Z")
I did not flash it yet. I was out on the field today and just ran as is. I am now confident that DVL extension is causing the issue. I did upgrade the Ardusub to 4.7.0 couple days ago. Seemed like it was working for about ~20minutes or so with DVL extension on with “surftrak” mode. After certain disconnect and MYGCS heartbeat loss I remembered to log the dumps. Here is dump file without DVL extension [cockpit-mavlink-dump-2026-08-04T19-49-33-779Z.jsonl](https://discuss.bluerobotics.com/uploads/short-url/z44l9VutDnho6bpdIl3Xi7BetN3.jsonl) (4.3 MB) with DVL extension [cockpit-mavlink-dump-2026-08-04T19-47-43-424Z\_with\_dvl.jsonl](https://discuss.bluerobotics.com/uploads/short-url/gAUYFuOJNMnnm14ed3RkIxr6F1w.jsonl) (3.5 MB) At this point do you still recommend to go with the flash?with ardusub firmware? Thanks ---
**Author:** ![tony-white](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/tony-white/32/13297_2.png) [@tony-white](https://discuss.bluerobotics.com/u/tony-white)\ **Post date:** [August 4, 2026, 11:06pm UTC](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376/30 "2026-08-04T23:06:20Z")
Yes, the issue the firmware addresses is very relevant to the DVL! It could potentially resolve your problems, please test and let us know ---
**Author:** ![minskim88](https://avatars.discourse-cdn.com/v4/letter/m/9de0a6/32.png) [@minskim88](https://discuss.bluerobotics.com/u/minskim88)\ **Post date:** [August 5, 2026, 5:18pm UTC](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376/31 "2026-08-05T17:18:12Z")
Good morning @tony-white , Ok firmware flash was okay and will be diving today. Let you know how it goes. Do you want me to collect dumps? ---
**Author:** ![tony-white](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/tony-white/32/13297_2.png) [@tony-white](https://discuss.bluerobotics.com/u/tony-white)\ **Post date:** [August 5, 2026, 6:23pm UTC](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376/32 "2026-08-05T18:23:28Z")
Hi @minskim88 - Sure! Those and a autopilot .BIN log would be great! ---
**Author:** ![minskim88](https://avatars.discourse-cdn.com/v4/letter/m/9de0a6/32.png) [@minskim88](https://discuss.bluerobotics.com/u/minskim88)\ **Post date:** [August 5, 2026, 9:04pm UTC](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376/33 "2026-08-05T21:04:11Z")
@tony-white , Everything worked great today! Except, under blueos page log browser was empty. I went under File Browser and ardupilot\_logs\>firmware\>logs to dig up these .BIN. Let me know if this is not it. [00431-2026-08-05\_19-18-07.tlog](https://discuss.bluerobotics.com/uploads/short-url/6O0sc2is0HaP473EQ1m0QNx4QAZ.tlog) (9.0 MB) [00000123.BIN](https://discuss.bluerobotics.com/uploads/short-url/13nLZO9w6xt33JPbJ3CUyUXypH5.BIN) (7.5 MB) [Cockpit (Aug 05, 2026 - 13꞉07꞉24 GMT-7).syslog](https://discuss.bluerobotics.com/uploads/short-url/wdatauZfvVrfr6EsvoeRW2Gawl4.syslog) (78.2 KB) [cockpit-mavlink-dump-2026-08-05T20-10-11-151Z\_w\_DVL.jsonl](https://discuss.bluerobotics.com/uploads/short-url/mGtVR1ahXlyB714brLgRjDUJlTa.jsonl) (3.6 MB) [cockpit-mavlink-dump-2026-08-05T20-11-29-063Z\_no\_DVL.jsonl](https://discuss.bluerobotics.com/uploads/short-url/5uSMJyhbv03BKP9w4UCJqxl6XJN.jsonl) (2.9 MB) ---
**Author:** ![tony-white](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/tony-white/32/13297_2.png) [@tony-white](https://discuss.bluerobotics.com/u/tony-white)\ **Post date:** [August 5, 2026, 10:17pm UTC](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376/34 "2026-08-05T22:17:37Z")
Hi @minskim88 - Thanks for the logs! It seems this build really has improved things: ![image](https://us1.discourse-cdn.com/flex019/uploads/bluerobotics/original/3X/c/8/c8176756c0df6c37cdb17c04d3970abffaf80ad2.png) The team will continue testing and work to get it merged in! Thanks for your patience and time in testing this - considering the issue resolved! [Previous page](https://discuss.bluerobotics.com/t/mygcs-heartbeat-lost-fiber-optic-cable/23376.md?page=1)