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Has anyone decoded the log headers/messages from the Tello?

SMerrony

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I've noticed that about every 2 seconds the Tello sends a Log Header message.

It seems to start with a firmware build timestamp, and ends with "DJI LOG V3".

Is this a well-known format?
 
I believe if you ack the header you will start getting the log data itself. The header and the log data are written verbatim to a .DAT file in the stock Tello app.

I took a look at it the format of the log (via the .dat file) a while back. I was able to figure out they they are packets with headers and data. And not much else. The data seems to be highly repetitive mostly the same byte repeated. And there is a LOT of it. It might be sensor data or maybe image data. Possibly something to do with optical flow.

The first 0x100 bytes are the header and then the data starts looking like this.

55 3D 00 7F 00 80 EE EF 57 00 CE CE CE CE CE CE DE CE B5 A2 C3 AD A1 A3 BE AF BD BD B3 9D 97 80 8D B1 9A 81 9E 81 82 81 89 97 B1 98 8B 9C 87 88 97 B1 8D 81 80 88 87 89 C0 E4 EE 15 70
55 4C 00 0D 00 80 1E F0 57 00 3E 3E 3E 3E 3E 3E 2E 3E 45 52 33 5D 51 53 4E 5F 4D 4D 43 7B 70 7F 7C 72 7B 24 36 2E 37 32 69 41 78 6D 6A 71 6E 36 2E 30 2E 2E 2E 2E 2E 2E 37 32 69 41 78 6D 36 2E 30 2E 2E 2E 2E 2E 2E 37 14 1E 6C AF
55 5B 00 8F 00 80 F7 F0 57 00 D7 D7 D7 D7 D7 D7 C7 D7 AC BB DA B4 B8 BA A7 B6 A4 A4 AA 92 99 96 95 9B 92 CD DF C6 DE DB 80 A8 91 84 83 98 87 DF CE D9 C2 C7 C7 C7 C7 C7 DE DB 80 A8 91 84 DF C6 C2 C7 D9 C7 C7 C7 C7 C7 C7 DE DB 96 82 83 98 A8 94 96 9B 9E DF C7 DE FD F7 4E A2
55 3D 00 7F 00 80 12 F1 57 00 32 32 32 32 32 32 22 32 49 5E 3F 51 5D 5F 42 53 41 41 4F 61 6B 7C 71 4D 66 7D 62 7D 7E 7D 75 6B 4D 64 77 60 7B 74 6B 4D 71 7D 7C 74 7B 75 3C 18 12 F2 92
55 4E 00 9C 00 80 35 F1 57 00 15 15 15 15 15 15 05 15 6E 79 18 76 7A 78 65 74 66 66 68 50 5B 54 57 59 50 0F 1D 04 1C 19 42 6A 53 46 41 5A 45 1D 0C 1B 00 05 05 05 05 05 1C 19 42 6A 53 46 1D 04 00 05 1B 05 05 05 05 05 05 1C 3F 35 02 93
55 3D 00 7F 00 80 65 F2 57 00 45 45 45 45 45 45 55 45 3E 29 48 26 2A 28 35 24 36 36 38 16 1C 0B 06 3A 11 0A 15 0A 09 0A 02 1C 3A 13 00 17 0C 03 1C 3A 06 0A 0B 03 0C 02 4B 6F 65 AB F8
55 4E 00 9C 00 80 89 F2 57 00 A9 A9 A9 A9 A9 A9 B9 A9 D2 C5 A4 CA C6 C4 D9 C8 DA DA D4 EC E7 E8 EB E5 EC B3 A1 B8 A0 A5 FE D6 EF FA FD E6 F9 A1 B0 A7 BC B9 B9 B9 B9 B9 A0 A5 FE D6 EF FA A1 B8 BC B9 A7 B9 B9 B9 B9 B9 B9 A0 83 89 65 55
55 46 00 EA 00 80 E6 F2 57 00 C6 C6 C6 C6 C6 C6 D6 C6 BD AA CB A1 BF B4 A9 B9 A7 A5 A5 BB 81 9F 94 B9 87 85 85 B9 85 89 88 80 8F 81 C8 8B 95 85 B9 94 83 97 93 8F 94 83 B9 95 8F 82 83 DC CE D6 CF C6 EC E6 A6 A7
55 48 00 36 00 80 FE F2 57 00 DE DE DE DE DE DE CE DE A5 B2 D3 BA BC B9 CF A3 9D 9F 92 97 A1 8D 89 97 8A 9D 96 A1 9D 91 90 98 97 99 D0 97 93 8B A1 8E 8C 91 8E 9B 92 92 9B 8C A1 9D 9F 92 97 C4 D6 CC D7 DE F4 FE 15 82
55 47 00 2E 00 80 67 F5 57 00 47 47 47 47 47 47 57 47 3C 2B 4A 20 3E 35 28 38 26 24 24 3A 00 1E 15 38 06 04 04 38 04 08 09 01 0E 00 49 0A 14 04 38 15 02 16 12 0E 15 02 38 14 0E 03 02 5D 4F 51 54 4E 47 6D 67 54 24
55 48 00 36 00 80 80 F5 57 00 A0 A0 A0 A0 A0 A0 B0 A0 DB CC AD C4 C2 C7 B1 DD E3 E1 EC E9 DF F3 F7 E9 F4 E3 E8 DF E3 EF EE E6 E9 E7 AE E9 ED F5 DF F0 F2 EF F0 E5 EC EC E5 F2 DF E3 E1 EC E9 BA A8 B2 A9 A0 8A 80 90 B7
55 3D 00 7F 00 80 97 F5 57 00 B7 B7 B7 B7 B7 B7 A7 B7 CC DB BA D4 D8 DA C7 D6 C4 C4 CA E4 EE F9 F4 C8 E3 F8 E7 F8 FB F8 F0 EE C8 E1 F2 E5 FE F1 EE C8 F4 F8 F9 F1 FE F0 B9 9D 97 C5 49
55 4E 00 9C 00 80 BE F5 57 00 9E 9E 9E 9E 9E 9E 8E 9E E5 F2 93 FD F1 F3 EE FF ED ED E3 DB D0 DF DC D2 DB 84 96 8F 97 92 C9 E1 D8 CD CA D1 CE 96 87 90 8B 8E 8E 8E 8E 8E 97 92 C9 E1 D8 CD 96 8F 8B 8E 90 8E 8E 8E 8E 8E 8E 97 B4 BE EF 4F
55 61 00 45 00 80 EC F5 57 00 CC CC CC CC CC CC DC CC B7 A0 C1 AF AA AB B1 85 81 99 B3 8F 8D 80 85 B3 9F 98 8D 98 89 B3 82 83 98 85 8A 95 C1 B7 DD DC D5 B1 D6 CC 99 82 87 82 83 9B CC 89 9A 89 82 98 CC 98 95 9C 89 C0 CC 83 8A 8A 9F 89 98 D6 CC DC C0 CC 9F 85 96 89 D6 CC DF CD E1 E6 EC 5B 02
55 39 00 44 00 80 F9 F6 57 00 D9 D9 D9 D9 D9 D9 C9 D9 A2 B5 D4 AB BA A4 8B 9C 98 9D D9 9F 95 98 8A 91 D9 8A 8C 9A 9A 9C 8A 8A D5 D9 9A 8C 8B D9 8D 80 89 9C C3 C8 F9 D1 6B
55 29 00 A8 00 80 17 F7 57 00 37 37 37 37 37 37 27 37 4C 5B 3A 45 54 4A 29 24 21 23 37 26 27 25 23 37 26 21 2F 23 17 E9 0B
55 29 00 A8 00 80 32 F7 57 00 12 12 12 12 12 12 02 12 69 7E 1F 60 71 6F 0C 01 04 06 12 03 02 00 06 12 03 04 0A 06 32 36 BE
55 29 00 A8 00 80 4D F7 57 00 6D 6D 6D 6D 6D 6D 7D 6D 16 01 60 1F 0E 10 73 7E 7B 79 6D 7C 7D 7F 79 6D 7C 7B 75 79 4D 53 33
55 29 00 A8 00 80 68 F7 57 00 48 48 48 48 48 48 58 48 33 24 45 3A 2B 35 56 5B 5E 5C 48 59 58 5A 5C 48 59 5E 50 5C 68 8C 86
55 3A 00 11 00 80 62 DC 5D 00 42 42 42 42 42 42 52 42 39 2E 4F 21 24 25 3F 32 2F 58 03 06 06 42 10 0D 0D 16 42 15 0D 10 09 58 42 12 0F 3D 0D 0C 3D 16 0B 01 09 6F 68 62 3A 1C
55 37 00 98 00 80 A3 DC 5D 00 83 83 83 83 83 83 93 83 F8 EF 8E F0 E6 ED F0 EC F1 FE F8 E2 F0 F1 FE C2 D0 D1 83 CB CC D0 D7 83 D0 DA CD C0 83 D0 D7 C2 D1 D7 A3 4D 09
55 41 00 84 00 80 BD DC 5D 00 9D 9D 9D 9D 9D 9D 8D 9D E6 F1 90 EE F8 F3 EE F2 EF E0 E6 FC EE EF E0 CE C4 D3 DE 9D D5 D2 CE C9 9D D1 D8 DC D9 9D D2 DB DB CE D8 C9 9D 8D C5 8C 8C DC B0 B7 BD 76 45
55 31 00 32 00 80 B3 DF 5D 00 93 93 93 93 93 93 83 93 E8 FF 9E E0 F6 FD E0 FC E1 EE 93 DB C4 EC C5 D6 C1 93 C5 DC DF C7 D2 D4 D6 89 93 83 B3 D0 48
55 38 00 80 00 80 55 E0 5D 00 75 75 75 75 75 75 65 75 0E 19 78 06 1C 18 08 27 30 34 31 75 25 34 27 34 38 30 21 30 27 75 26 20 36 36 30 26 26 33 20 39 39 2C 74 55 D6 95
55 4D 00 C9 00 80 D2 E0 5D 00 F2 F2 F2 F2 F2 F2 E2 F2 89 9E FF 94 9F 87 FD 9F 9D 86 9D 80 8F A0 B7 B3 B6 F2 BF BD A6 BD A0 F2 B4 BD A0 B1 B7 F2 B6 BB A1 B3 B0 BE B7 F2 B4 BE B3 B5 F2 A1 A7 B1 B1 B7 A1 A1 B4 A7 BE BE AB F3 D2 6E 13
55 2C 00 57 00 80 FD E0 5D 00 DD DD DD DD DD DD CD DD A6 B1 D0 AE B8 B3 AE B2 AF A0 94 90 88 DD 9A 8F 92 88 8D CD DD 92 96 FD 20 52
55 3F 00 EE 00 80 21 E1 5D 00 01 01 01 01 01 01 11 01 7A 6D 0C 66 78 73 6E 7E 60 62 62 7C 48 4C 54 7E 11 01 46 53 4E 54 51 0C 1F 52 44 4F 52 4E 53 7E 48 45 1B 42 16 40 19 14 16 01 21 99 C1
55 47 00 2E 00 80 5D E1 5D 00 7D 7D 7D 7D 7D 7D 6D 7D 06 11 70 1A 04 0F 12 02 1C 1E 1E 00 3A 24 2F 02 3C 3E 3E 02 3E 32 33 3B 34 3A 73 30 2E 3E 02 2F 38 2C 28 34 2F 38 02 2E 34 39 38 67 75 6B 6E 74 7D 57 5D 03 19
55 48 00 36 00 80 76 E1 5D 00 56 56 56 56 56 56 46 56 2D 3A 5B 32 34 31 47 2B 15 17 1A 1F 29 05 01 1F 02 15 1E 29 15 19 18 10 1F 11 58 1F 1B 03 29 06 04 19 06 13 1A 1A 13 04 29 15 17 1A 1F 4C 5E 44 5F 56 7C 76 00 63
55 61 00 45 00 80 22 E2 5D 00 02 02 02 02 02 02 12 02 79 6E 0F 65 7B 70 6D 7D 63 61 61 7F 56 57 50 4C 02 4D 4C 02 56 47 4F 52 02 41 56 50 4E 0A 12 0B 0E 02 41 57 50 7D 56 47 4F 52 18 0F 17 12 0C 12 0E 02 50 47 43 51 4D 4C 18 56 47 4F 52 02 41 56 50 4E 02 41 4D 50 47 02 4B 4C 4B 56 22 63 06
55 57 00 C2 00 80 48 E2 5D 00 68 68 68 68 68 68 78 68 13 04 65 0F 11 1A 07 17 09 0B 0B 15 21 25 3D 17 78 68 27 24 2C 68 25 21 3B 17 2B 29 24 21 17 2E 24 29 2F 72 2E 2E 2E 2E 68 25 21 3B 17 2B 29 24 21 17 2A 27 29 3A 2C 17 2E 24 29 2F 72 2E 2E 2E 2E 68 48 95 68
55 32 00 67 FD FF 10 BA 39 03 5F 60 3E 4B 73 7F 7E 76 79 77 4D 1A 7E 71 7D 75 19 53 7F 7E 64 62 7F 7C 7C 75 62 1A 64 69 60 75 19 21 20 20 20 10 7D F9
55 32 00 67 AE 06 EF 1B 3A 03 EF 97 6B AA EF EF EF EF EF EF EF EF EF 8F BE AA 60 FF EF EF EF EF EF EF EF EF 8C EF EF EE EF EF EF EF EF EF EF EF AB 69
55 16 00 9D B0 06 0E 1C 3A 03 0E 0E 0A 0E F1 F1 0E 0E 0E 0E 34 99
55 10 00 37 10 00 91 DC 3A 03 F5 91 90 A6 C4 48
55 84 00 CF 00 08 53 40 3B 03 53 53 53 53 53 53 53 53 53 53 53 53 53 53 53 53 14 92 36 91 A4 9D 41 ED 88 C9 A9 6E 27 FF 2A EC 9A CC 3C EF A3 E9 42 68 8D 3B E4 6A 85 CC 37 91 2D B3 2D 6C 60 2C 22 EE E3 98 C7 EE 53 5D 4A EA D3 B1 92 68 73 9B 37 6E 53 03 64 6F 53 53 53 53 53 53 53 53 6C F7 61 6E F5 0F 2F EF A0 14 AE 69 0B BA A2 6A 53 53 53 53 53 53 27 58 EF 51 08 5B 53 53 53 53 53 53 40 73 CC B1
55 4C 00 0D 10 08 93 40 3B 03 93 93 93 93 93 93 93 93 AC 37 A1 AE FD 80 85 AB B5 27 88 A9 45 0C F7 D1 6B BF C2 AF 21 F0 50 AE 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 53 93 BB 93 92 93 83 83 93 93 93 93 4E 41
55 34 00 CD A0 08 C0 40 3B 03 DE 23 BE FF A9 E0 AD 7D 59 87 55 7D FD F2 95 FB 22 5E A6 02 48 A6 22 FD 58 44 5C FC C0 C0 C0 C0 C0 C0 C0 C0 D0 D0 C0 C0 46 51
55 2D 00 93 00 80 66 8E 3B 03 46 46 46 57 56 54 50 46 3D 2A 4B 34 25 3B 05 0A 14 46 14 05 39 14 03 15 13 0B 03 39 0A 09 05 0D 66 71 A1
55 24 00 21 FD FF 0B 4C 3D 03 44 7B 25 7E 62 65 7F 38 39 54 7F 02 68 7F 79 67 54 7F 62 68 60 2B 3B 0B 0C 8D
55 48 00 36 E8 03 2F 56 3E 03 29 2B 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2E 2D 2F 2F 2F 2F 25 2F A7 3C 2F 2F 2F 2F 2F 2F 2F 2F 3F 2A 2D 2E 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F 2F EA E5
55 40 00 40 E9 03 48 56 3E 03 48 48 48 49 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 49 48 48 42 48 48 48 48 08 48 48 C8 77 8C 41 48 48 48 48 48 48 8C 41 48 48 48 48 6A 29
55 27 00 74 EA 03 B0 56 3E 03 B0 B0 B0 B0 B0 B0 B0 B0 B0 B0 B0 B0 B0 B0 B0 B0 B0 B0 B0 4F B0 B0 B0 B0 B0 B0 B0 84 94
55 84 00 CF 00 08 42 D4 3E 03 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 88 52 25 80 2A B3 51 FC BD CA BE 7F 89 1C 3B FD 48 56 32 FE F8 20 21 78 5B 82 4D 78 CC D5 26 80 22 A2 3C 7D E2 39 33 FF 56 98 D6 FF 02 B8 66 FB 42 4D 6C F9 62 2B 39 7F 42 94 CF 7E 42 42 42 42 42 42 42 42 D1 10 4A 7F 8E 41 3E FE 88 1A BF 78 59 33 B1 7B 42 42 42 42 42 42 3B 49 FE 40 1E 4A 42 42 42 42 42 42 79 62 A1 76
55 4C 00 0D 10 08 7F D4 3E 03 7F 7F 7F 7F 7F 7F 7F 7F EC 2D 77 42 80 32 7B 47 AE 96 7E 45 F1 E8 1B 3D 8C DF 28 43 E9 52 BC 42 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F BF 7F 57 7F 7E 7F 5B 6F 7F 7F 7F 7F A6 90
55 34 00 CD A0 08 AA D4 3E 03 52 48 D4 95 50 B0 C7 17 3B F3 3F 17 66 19 FC 91 F3 0B CC 68 F0 2A 47 97 82 CD 70 96 AA AA AA AA AA AA AA AA 8E BA AA AA F5 77
55 10 00 37 66 27 42 06 3F 03 42 42 43 42 47 65
55 5C 00 E1 65 27 72 06 3F 03 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 D2 57 33 49 65 BF 6D C9 75 08 11 4F 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 F7 4C

I would love to figure it out. Could be some good stuff in there.
 
Wow. That actually worked?? I tried that program a few months ago and it didn't accept the file then.

Edit: Yep, seems to work perfectly. Amazing. I do wonder if there are any Tello specific columns missing.
 
Last edited:
Wow. That actually worked?? I tried that program a few months ago and it didn't accept the file then.

Edit: Yep, seems to work perfectly. Amazing. I do wonder if there are any Tello specific columns missing.
Yes, version 3.6.0 will have some of those columns working.
 
Excellent! Nice to meet you. I have been using your program since my Phantom3 days. I think I used to to find a lost bird once or twice. :)

Any idea what the missing columns are yet? I am hoping they include some sort of relative X/Y. If so we can do make commands like fly forward 5m work.
 
... maybe this could be usefull ...

1526822021412.DAT

P.S. this is from official Tello app ...
Is this from the most recent FW and most recent version of the Tello App? The reason that I ask is that the .DAT is inconsistent in a way that it will be difficult to make DatCon work correctly. Typically, there are several FW updates when DJI debuts a new drone and the .DAT structure will change with each FW.
 
... the app is the last version and this is the first screenshoot of that file:

1528729257823.png
 
I have a variety of .DAT files across the different firmwares if you need them.

What is being decoded seems right. How is the data inconsistent?

Maybe it is because of how it was developed with DJI. I am really curious about the relationship between DJI and Ryze on this project. Did the DJI guys do the software or just hand the code to Ryze. That is if they aren't just the same company as rumor has it.
 
I have a variety of .DAT files across the different firmwares if you need them.

What is being decoded seems right. How is the data inconsistent?

Maybe it is because of how it was developed with DJI. I am really curious about the relationship between DJI and Ryze on this project. Did the DJI guys do the software or just hand the code to Ryze. That is if they aren't just the same company as rumor has it.
Yes, could you provide some .DATs from different FW versions please?

The magnetometer data isn't correct, for example.
 
Attached are logs from firmwares versions from Feb, Mar and Apr.

Magnetometer? I don't think the Tello has a compass.
 

Attachments

  • LogsFromFebMarApr.zip
    4.2 MB · Views: 29
Attached are logs from firmwares versions from Feb, Mar and Apr.

Magnetometer? I don't think the Tello has a compass.
Didn't know that. Could you check and see what data should be there and isn't. I know the Controller data is missing and how to fix that.
 
Didn't know that. Could you check and see what data should be there and isn't. I know the Controller data is missing and how to fix that.
All the columns that I have looked at in detail seem to be correct (unless it is blank or obviously wrong like NAN). Its hard to say what is missing. What I _want_ there to be is something like direction and distance of travel but I don't know if it exists in the log. The Tello does have a downfacing camera that is used for optical flow tracking. Anything to do with that?

How much of the data you are seeing is unknown?
 

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