Fix SURFboard connection reset on old SB8200 firmware#308
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SB8200 modems on older firmware reset the TCP connection after sending HTTP 200 headers but before the response body is fully readable. This is caused by the modem's embedded web server tearing down keep-alive connections prematurely. Changes: - Send Connection: close on all HNAP requests unconditionally, not just during legacy TLS. This prevents the modem from attempting keep-alive and ensures the response is fully transmitted before socket teardown. - Handle ConnectionError in get_docsis_data() with session reset and re-authentication, so mid-poll transport failures recover gracefully instead of aborting the entire poll cycle. Refs: #184
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This was referenced Apr 2, 2026
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Summary
Connection: closeheader to all HNAP requests, preventing the modem's embedded web server from tearing down keep-alive connections before the response body is fully transmittedConnectionErroringet_docsis_data()with session reset and re-authentication, so mid-poll transport failures recover gracefully instead of aborting the poll cycleThe full fallback chain is: normal HTTPS -> legacy TLS HTTPS -> HTTP.
Context
SB8200 modems on older firmware (e.g.
AB01.02.053.05_051921) exhibit a pattern where the HNAP POST returns HTTP 200 headers, but the modem resets the TCP connection (ConnectionResetError 104) before the response body can be read. This happens consistently on every retry when using persistent HTTP/1.1 connections.Test plan
Refs: #184