How to use CFDP?

[GallopingTurtle]

This may well be a noobie question, but documentation is sparse and I am struggling.

How do I setup the CF app with cFS?

My setup steps are:

• Add CF as submodule to apps
• Rename CF dir to cf
• add cf to targets.cmake (list(APPEND MISSION_GLOBAL_APPLIST sample_app sample_lib cf))
• add cf to the .scr (CFE_APP, cf, CF_AppMain, CF, 90, 16384, 0x0, 0;)
• Add CF_WAKE_UP_MID to sch_lab's table ({CFE_SB_MSGID_WRAP_VALUE(CF_WAKE_UP_MID), 10, 0},)
• Build and run

Now I am trying to send a file to cFS via CFDP using this python lib from this example (full script below)

Now I can see that three PDU's are being sent which upon inspection with a debugger appear compliant with the spec (at least the header according to Table 5-1 of ) and also contain the file contents. However, they are being dropped by CI with the message:

EVS Port1 1980-014-12:11:40.28903 66/1/CI_LAB_APP 8: CI: cmd dropped - length mismatch, 264 (hdr) / 40 (packet)
EVS Port1 1980-014-12:11:40.28904 66/1/CI_LAB_APP 10: CI_LAB: Ingest failed, status=-939524094
EVS Port1 1980-014-12:11:40.28906 66/1/CI_LAB_APP 8: CI: cmd dropped - length mismatch, 264 (hdr) / 30 (packet)
EVS Port1 1980-014-12:11:40.28906 66/1/CI_LAB_APP 10: CI_LAB: Ingest failed, status=-939524094
EVS Port1 1980-014-12:11:40.28907 66/1/CI_LAB_APP 8: CI: cmd dropped - length mismatch, 264 (hdr) / 17 (packet)
EVS Port1 1980-014-12:11:40.28907 66/1/CI_LAB_APP 10: CI_LAB: Ingest failed, status=-939524094

That status, -939524094 = 0xC8 00 00 02 => CFE_STATUS_WRONG_MSG_LENGTH. Makes sense given other lines.

I used a debugger to confirm that CF_CFDP_CycleEngine is being called, and that CF_AppData.engine.enabled is truthy.

Is there a better (free and open source) way to send cfdp commands? Is there some setup I've missed?

Python script

import logging
import time

import cfdp
from cfdp.transport.udp import UdpTransport
from cfdp.filestore import NativeFileStore


logging.basicConfig(level=logging.DEBUG)

udp_transport = UdpTransport(routing={"*": [("127.0.0.1", 1234)]})
udp_transport.bind("127.0.0.1", 1235)

# this dir exists
cfdp_entity = cfdp.CfdpEntity(
    entity_id=1, filestore=NativeFileStore("upload"), transport=udp_transport
)

# the file ./upload/helloworld exists and is readable
transaction_id = cfdp_entity.put(
    destination_id=2,
    source_filename="/helloworld",
    destination_filename="/cf/helloworld",
    transmission_mode=cfdp.TransmissionMode.UNACKNOWLEDGED,
)

while not cfdp_entity.is_complete(transaction_id):
    time.sleep(0.1)

cfdp_entity.shutdown()
udp_transport.unbind()

[skliper]

Note the PDU's need to be wrapped in CCSDS space packets for ci_lab to ingest them. You could run cFS w/ CF on both the source and destination as free/open source way to transfer files. I can't endorse anything, but just as a reference https://github.com/OpenC3/openc3-cosmos-cfdp is another method I've seen used.