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[modem]: Add support for guessing mode #612

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merged 2 commits into from
Nov 6, 2024

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david-cermak
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@david-cermak david-cermak commented Jul 10, 2024

  • Supports only DATA and PPP mode

  • Add CMUX modes

@david-cermak david-cermak added this to the modem-v1.2.0 milestone Jul 10, 2024
@david-cermak david-cermak self-assigned this Jul 10, 2024
@david-cermak david-cermak force-pushed the feat/modem_mode_detect branch 2 times, most recently from 85abac4 to 6f4231b Compare July 15, 2024 06:41
@david-cermak david-cermak marked this pull request as ready for review July 15, 2024 06:41
components/esp_modem/include/cxx_include/esp_modem_dte.hpp Outdated Show resolved Hide resolved
return false;
}
mode = modem_mode::UNDEF;
ESP_LOGI("DCE mode", "Detected mode: %d", static_cast<int>(guessed));
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Do we need to log it in INFO mode? Could we move to DEBUG or VERBOSE?

components/esp_modem/src/esp_modem_dce.cpp Outdated Show resolved Hide resolved
components/esp_modem/src/esp_modem_dce.cpp Outdated Show resolved Hide resolved
// Check whether the response resembles the "golden" reply (for these 3 protocols)
if (reply_pos >= sizeof(probe::ppp::lcp_echo_reply_head)) {
// check for initial 2 bytes
uint8_t *ptr = static_cast<uint8_t *>(memmem(reply, reply_pos, probe::ppp::lcp_echo_reply_head, 2));
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Build a string_view from the received buffer and use provided algorithms might lead to simpler code here.

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any idea how to do it without reinterpret cast?

    std::string_view reply_view(reinterpret_cast<const char*>(reply), reply_size);
    
    // Create a string_view for the bytes to compare against
    std::string_view head_view(reinterpret_cast<const char*>(ppp::lcp_echo_reply_head.data()), 2);

    // Check if the reply starts with the first 2 bytes of lcp_echo_reply_head
    return reply_view.starts_with(head_view);

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The thing is that I'm actually testing if the current protocol is binary or ascii, so I think the best option is to just use the old good memmem()...

@david-cermak david-cermak merged commit 2442f6b into espressif:master Nov 6, 2024
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3 participants