feat: allow stoppage of downloader to free up network

[de-sh]

Closes #

Changes

Why?

There might be a requirement in the system to disable the downloader in order to prefer other network access events on the system that might otherwise be hindered by large downloads.

Trials Performed

1. Start uplink
2. Trigger a download action, wait for the download to start on the device
3. Once the download has started, disable downloader with:

curl -X PUT http://localhost:3333/disable_downloader

4. Observe if download continues or if the timeout is short enough, for the action to be timedout.
5. After noticing that download is disabled as expected, enable downloader with:

curl -X PUT http://localhost:3333/enable_downloader

6. Wait for the download to complete as expected.

Observations:

  2024-05-03T06:10:17.367319Z TRACE uplink::collector::downloader: Downloading: size = 2 GiB, percentage = 3, elapsed = 13s

  2024-05-03T06:10:17.371487Z TRACE uplink::collector::downloader: Downloading: size = 2 GiB, percentage = 3, elapsed = 13s

  2024-05-03T06:10:17.371670Z TRACE uplink::collector::downloader: Downloading: size = 2 GiB, percentage = 3, elapsed = 13s

  2024-05-03T06:10:17.371776Z TRACE uplink::collector::downloader: Downloading: size = 2 GiB, percentage = 3, elapsed = 13s

  2024-05-03T06:10:17.371832Z  INFO uplink::console: Downloader stopped

  2024-05-03T06:10:17.379613Z TRACE uplink::collector::downloader: Downloading: size = 2 GiB, percentage = 3, elapsed = 13s

  2024-05-03T06:10:24.744384Z  INFO uplink::base::bridge::streams:        action_status: points = 1     batches = 1     latency = 269

  2024-05-03T06:10:24.745014Z DEBUG uplink::base::mqtt: Outgoing = Publish(86)

  2024-05-03T06:10:24.754630Z TRACE uplink::collector::device_shadow: Ping took 10.973ms

  2024-05-03T06:10:24.754845Z TRACE uplink::base::bridge::streams: Initialized stream buffer for device_shadow

  2024-05-03T06:10:24.809573Z DEBUG uplink::base::mqtt: Incoming = PubAck(PubAck { pkid: 86 })

  2024-05-03T06:10:24.914543Z DEBUG uplink::base::mqtt: Outgoing = PingReq

  2024-05-03T06:10:24.968893Z DEBUG uplink::base::mqtt: Incoming = PingResp

  2024-05-03T06:10:24.968965Z  INFO uplink::base::mqtt:                           connected: publishes = 13  pubacks = 13  pingreqs = 1   pingresps = 1   inflight = 0

  2024-05-03T06:10:24.969574Z DEBUG uplink::base::mqtt: Outgoing = Publish(87)

  2024-05-03T06:10:25.020009Z DEBUG uplink::base::mqtt: Incoming = PubAck(PubAck { pkid: 87 })

  2024-05-03T06:10:26.566884Z  INFO uplink::console: Downloader started

  2024-05-03T06:10:27.393013Z TRACE uplink::collector::downloader: Downloading: size = 2 GiB, percentage = 3, elapsed = 23s

  2024-05-03T06:10:27.393574Z TRACE uplink::collector::downloader: Downloading: size = 2 GiB, percentage = 3, elapsed = 23s

  2024-05-03T06:10:27.393873Z TRACE uplink::collector::downloader: Downloading: size = 2 GiB, percentage = 3, elapsed = 23s

  2024-05-03T06:10:27.394200Z TRACE uplink::collector::downloader: Downloading: size = 2 GiB, percentage = 3, elapsed = 23s

  2024-05-03T06:10:27.394501Z TRACE uplink::collector::downloader: Downloading: size = 2 GiB, percentage = 3, elapsed = 23s