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fix(modem): Refine mode switch data->command

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* netif.stop() moved after setting the transition callback
* send PPP escape sequence if enabled before waiting for transition to
complete
* add newline character before sync() command (after the "+++")

Closes https://github.com/espressif/esp-protocols/issues/692
This commit is contained in:
David Cermak
2024-11-28 21:34:15 +01:00
parent 849fe7b6cb
commit 8b6ea3311a
4 changed files with 20 additions and 5 deletions
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9
components/esp_modem/Kconfig
View File

@ -76,4 +76,13 @@ menu "esp-modem"
help
If enabled, APIs to add URC handler are available
config ESP_MODEM_PPP_ESCAPE_BEFORE_EXIT
bool "Send escape sequence when switching PPP -> CMD"
default n
help
If enabled, the library sends a PPP escape ("+++" command)
to switch to command mode. This make switching from PPP to CMD
mode more robust for some devices (e.g. Quectel), but might cause
trouble for other devices (e.g. SIMCOM).
endmenu

4
components/esp_modem/include/cxx_include/esp_modem_dce_module.hpp
View File

@ -77,7 +77,9 @@ public:
if (set_command_mode() == command_result::OK) {
return true;
}
Task::Delay(1000); // Mandatory 1s pause after escape
// send a newline to delimit the escape from the upcoming sync command
uint8_t delim = '\n';
dte->write(&delim, 1);
if (sync() == command_result::OK) {
return true;
}

11
components/esp_modem/src/esp_modem_dce.cpp
View File

@ -18,7 +18,6 @@ namespace transitions {
static bool exit_data(DTE &dte, ModuleIf &device, Netif &netif)
{
netif.stop();
auto signal = std::make_shared<SignalGroup>();
std::weak_ptr<SignalGroup> weak_signal = signal;
dte.set_read_cb([&netif, weak_signal](uint8_t *data, size_t len) -> bool {
@ -32,7 +31,7 @@ static bool exit_data(DTE &dte, ModuleIf &device, Netif &netif)
if (memchr(data, '\n', len))
{
ESP_LOG_BUFFER_HEXDUMP("esp-modem: debug_data (CMD)", data, len, ESP_LOG_DEBUG);
const auto pass = std::list<std::string_view>({"NO CARRIER", "DISCONNECTED"});
const auto pass = std::list<std::string_view>({"NO CARRIER", "DISCONNECTED", "OK"});
std::string_view response((char *) data, len);
for (auto &it : pass)
if (response.find(it) != std::string::npos) {
@ -44,8 +43,14 @@ static bool exit_data(DTE &dte, ModuleIf &device, Netif &netif)
}
return false;
});
netif.stop();
netif.wait_until_ppp_exits();
if (!signal->wait(1, 2000)) {
#ifdef ESP_MODEM_PPP_ESCAPE_BEFORE_EXIT
std::array<uint8_t, 3> ppp_escape = {'+', '+', '+'};
dte.write(ppp_escape.data(), ppp_escape.size());
#endif
if (!signal->wait(1, 2000)) { // wait for any of the disconnection messages
// if no reply -> set device to command mode
dte.set_read_cb(nullptr);
if (!device.set_mode(modem_mode::COMMAND_MODE)) {
return false;

1
components/esp_modem/src/esp_modem_netif_linux.cpp
View File

@ -52,7 +52,6 @@ void Netif::start()
void Netif::stop()
{
ppp_dte->set_read_cb(nullptr);
signal.clear(PPP_STARTED);
}