[guido4096]

Streaming endpoints sent many small fragments and continued attempting socket writes after a send failure. This could repeat socket waits for a disconnected or stalled client. The configuration-drift handler also terminated its HTTP response before its JSON scopes emitted their closing bytes.

Add a shared 1,024-byte chunk buffer that stops socket output after the first failure and returns that error to the HTTP server. Apply it to streaming endpoints and complete drift JSON before terminating the response. Reduce HTTP send/receive timeouts from 10/10 seconds to 3/5 seconds.

Validation

• 174 host tests passed on this standalone branch (macOS, POSIX enabled, original pinned eBUS revision f730dce).
• Whitespace checks passed. CI and a fresh firmware build for this isolated branch are pending.
• For the standalone macOS test run, the two mock-file fixes from part 1/5 were applied as temporary, uncommitted test-only overrides. Those files are not included in this PR.

Regressions cover preserved payload bytes (including embedded NULs), chunk coalescing, response termination, failures during streaming/final flush/termination, and valid configuration-drift JSON.

Device checks before marking ready

• Cancel or disconnect a streaming request, then confirm subsequent requests recover promptly.
• Check normal and slower Wi-Fi clients, configuration/command operations and firmware uploads with the shorter timeouts.
• Check HTTP-task stack margin with the added 1,024-byte buffer and sustained operation.

No on-device latency improvement or soak-test result is claimed here.

Related runtime fixes

Part 5/5 of the single-commit replacements for #430, split at the maintainer's request. Every PR targets master directly and contains only its corresponding change.

Part	Scope	PR / branch
1/5	Correct host-test mocks	#431
2/5	Bound Logs page retention	#432
3/5	Schedule diagnostics by elapsed time	#433
4/5	Protect string-pool IDs and concurrent access	#434
5/5	Buffer HTTP streams and stop after send failures	#435

Suggested merge order: the host-test mock fix first, then the other four changes independently. The five patches together reconstruct the exact tracked file tree of #430.

Source commit in #430: 50a798d.

[guido4096]

did the testing on my device, so far no problems detected, UI still responsive after 2 days.