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feat(esp-modem): Add support for manual CMUX operations
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Closes #168
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@david-cermak
david-cermak committed Oct 25, 2022
1 parent 5097065 commit 0a7f1c4
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Showing 7 changed files with 185 additions and 84 deletions.
12 changes: 11 additions & 1 deletion components/esp_modem/examples/modem_console/main/modem_console_main.cpp
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Expand Up @@ -210,7 +210,17 @@ extern "C" void app_main(void)
if (c->get_count_of(&SetModeArgs::mode)) {
auto mode = c->get_string_of(&SetModeArgs::mode);
modem_mode dev_mode;
if (mode == "CMD") {
if (mode == "CMUX1") {
dev_mode = esp_modem::modem_mode::CMUX_MANUAL_MODE;
} else if (mode == "CMUX2") {
dev_mode = esp_modem::modem_mode::CMUX_MANUAL_EXIT;
} else if (mode == "CMUX3") {
dev_mode = esp_modem::modem_mode::CMUX_MANUAL_SWAP;
} else if (mode == "CMUX4") {
dev_mode = esp_modem::modem_mode::CMUX_MANUAL_DATA;
} else if (mode == "CMUX5") {
dev_mode = esp_modem::modem_mode::CMUX_MANUAL_COMMAND;
} else if (mode == "CMD") {
dev_mode = esp_modem::modem_mode::COMMAND_MODE;
} else if (mode == "PPP") {
dev_mode = esp_modem::modem_mode::DATA_MODE;
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4 changes: 2 additions & 2 deletions components/esp_modem/include/cxx_include/esp_modem_dte.hpp
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Expand Up @@ -116,8 +116,8 @@ class DTE : public CommandableIf {
Lock internal_lock{}; /*!< Locks DTE operations */
unique_buffer buffer; /*!< DTE buffer */
std::shared_ptr<CMux> cmux_term; /*!< Primary terminal for this DTE */
std::shared_ptr<Terminal> command_term; /*!< Reference to the terminal used for sending commands */
std::shared_ptr<Terminal> data_term; /*!< Secondary terminal for this DTE */
std::shared_ptr<Terminal> term; /*!< Reference to the primary terminal (mostly for sending commands) */
std::shared_ptr<Terminal> other_term; /*!< Secondary terminal for this DTE */
modem_mode mode; /*!< DTE operation mode */
SignalGroup signal; /*!< Event group used to signal request-response operations */
command_result result; /*!< Command result of the currently exectuted command */
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7 changes: 6 additions & 1 deletion components/esp_modem/include/cxx_include/esp_modem_types.hpp
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Expand Up @@ -29,8 +29,13 @@ enum class modem_mode {
UNDEF,
COMMAND_MODE, /*!< Command mode -- the modem is supposed to send AT commands in this mode */
DATA_MODE, /*!< Data mode -- the modem communicates with network interface on PPP protocol */
CMUX_MODE /*!< CMUX (Multiplex mode) -- Simplified CMUX mode, which creates two virtual terminals,
CMUX_MODE, /*!< CMUX (Multiplex mode) -- Simplified CMUX mode, which creates two virtual terminals,
* assigning one solely to command interface and the other to the data mode */
CMUX_MANUAL_MODE, /*!< Enter CMUX mode manually -- just creates two virtual terminals */
CMUX_MANUAL_EXIT, /*!< Exits CMUX mode manually -- just destroys two virtual terminals */
CMUX_MANUAL_DATA, /*!< Sets the primary terminal to DATA mode in manual CMUX */
CMUX_MANUAL_COMMAND, /*!< Sets the primary terminal to COMMAND mode in manual CMUX */
CMUX_MANUAL_SWAP, /*!< Swaps virtual terminals in manual CMUX mode (primary <-> secondary) */
};

/**
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5 changes: 5 additions & 0 deletions components/esp_modem/include/esp_modem_c_api_types.h
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Expand Up @@ -36,6 +36,11 @@ typedef enum esp_modem_dce_mode {
ESP_MODEM_MODE_COMMAND, /**< Default mode after modem startup, used for sending AT commands */
ESP_MODEM_MODE_DATA, /**< Used for switching to PPP mode for the modem to connect to a network */
ESP_MODEM_MODE_CMUX, /**< Multiplexed terminal mode */
ESP_MODEM_MODE_CMUX_MANUAL, /**< CMUX manual mode */
ESP_MODEM_MODE_CMUX_MANUAL_EXIT, /**< Exit CMUX manual mode */
ESP_MODEM_MODE_CMUX_MANUAL_SWAP, /**< Swap terminals in CMUX manual mode */
ESP_MODEM_MODE_CMUX_MANUAL_DATA, /**< Set DATA mode in CMUX manual mode */
ESP_MODEM_MODE_CMUX_MANUAL_COMMAND, /**< Set COMMAND mode in CMUX manual mode */
} esp_modem_dce_mode_t;

/**
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25 changes: 17 additions & 8 deletions components/esp_modem/src/esp_modem_c_api.cpp
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Expand Up @@ -93,14 +93,23 @@ extern "C" esp_err_t esp_modem_set_mode(esp_modem_dce_t *dce_wrap, esp_modem_dce
if (dce_wrap == nullptr || dce_wrap->dce == nullptr) {
return ESP_ERR_INVALID_ARG;
}
if (mode == ESP_MODEM_MODE_DATA) {
return dce_wrap->dce->set_mode(modem_mode::DATA_MODE) ? ESP_OK : ESP_FAIL;
}
if (mode == ESP_MODEM_MODE_COMMAND) {
return dce_wrap->dce->set_mode(modem_mode::COMMAND_MODE) ? ESP_OK : ESP_FAIL;
}
if (mode == ESP_MODEM_MODE_CMUX) {
return dce_wrap->dce->set_mode(modem_mode::CMUX_MODE) ? ESP_OK : ESP_FAIL;
switch (mode) {
case ESP_MODEM_MODE_DATA:
return dce_wrap->dce->set_mode(modem_mode::DATA_MODE) ? ESP_OK : ESP_FAIL;
case ESP_MODEM_MODE_COMMAND:
return dce_wrap->dce->set_mode(modem_mode::COMMAND_MODE) ? ESP_OK : ESP_FAIL;
case ESP_MODEM_MODE_CMUX:
return dce_wrap->dce->set_mode(modem_mode::CMUX_MODE) ? ESP_OK : ESP_FAIL;
case ESP_MODEM_MODE_CMUX_MANUAL:
return dce_wrap->dce->set_mode(modem_mode::CMUX_MANUAL_MODE) ? ESP_OK : ESP_FAIL;
case ESP_MODEM_MODE_CMUX_MANUAL_EXIT:
return dce_wrap->dce->set_mode(modem_mode::CMUX_MANUAL_EXIT) ? ESP_OK : ESP_FAIL;
case ESP_MODEM_MODE_CMUX_MANUAL_SWAP:
return dce_wrap->dce->set_mode(modem_mode::CMUX_MANUAL_SWAP) ? ESP_OK : ESP_FAIL;
case ESP_MODEM_MODE_CMUX_MANUAL_DATA:
return dce_wrap->dce->set_mode(modem_mode::CMUX_MANUAL_DATA) ? ESP_OK : ESP_FAIL;
case ESP_MODEM_MODE_CMUX_MANUAL_COMMAND:
return dce_wrap->dce->set_mode(modem_mode::CMUX_MANUAL_COMMAND) ? ESP_OK : ESP_FAIL;
}
return ESP_ERR_NOT_SUPPORTED;
}
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138 changes: 92 additions & 46 deletions components/esp_modem/src/esp_modem_dce.cpp
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Expand Up @@ -14,6 +14,59 @@

namespace esp_modem {

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([weak_signal](uint8_t *data, size_t len) -> bool {
if (memchr(data, '\n', len))
{
ESP_LOG_BUFFER_HEXDUMP("esp-modem: debug_data", data, len, ESP_LOG_DEBUG);
const auto pass = std::list<std::string_view>({"NO CARRIER", "DISCONNECTED"});
std::string_view response((char *) data, len);
for (auto &it : pass)
if (response.find(it) != std::string::npos) {
if (auto signal = weak_signal.lock()) {
signal->set(1);
}
return true;
}
}
return false;
});
netif.wait_until_ppp_exits();
if (!signal->wait(1, 2000)) {
if (!device.set_mode(modem_mode::COMMAND_MODE)) {
return false;
}
}
dte.set_read_cb(nullptr);
if (!dte.set_mode(modem_mode::COMMAND_MODE)) {
return false;
}
return true;
}

static bool enter_data(DTE &dte, ModuleIf &device, Netif &netif)
{
if (!device.setup_data_mode()) {
return false;
}
if (!device.set_mode(modem_mode::DATA_MODE)) {
return false;
}
if (!dte.set_mode(modem_mode::DATA_MODE)) {
return false;
}
netif.start();
return true;
}

} // namespace transitions

/**
* Set mode while the entire DTE is locked
*/
Expand All @@ -36,8 +89,8 @@ bool DCE_Mode::set_unsafe(DTE *dte, ModuleIf *device, Netif &netif, modem_mode m
switch (m) {
case modem_mode::UNDEF:
break;
case modem_mode::COMMAND_MODE: {
if (mode == modem_mode::COMMAND_MODE) {
case modem_mode::COMMAND_MODE:
if (mode == modem_mode::COMMAND_MODE || mode >= modem_mode::CMUX_MANUAL_MODE) {
return false;
}
if (mode == modem_mode::CMUX_MODE) {
Expand All @@ -49,59 +102,23 @@ bool DCE_Mode::set_unsafe(DTE *dte, ModuleIf *device, Netif &netif, modem_mode m
mode = m;
return true;
}
netif.stop();
auto signal = std::make_shared<SignalGroup>();
std::weak_ptr<SignalGroup> weak_signal = signal;
dte->set_read_cb([weak_signal](uint8_t *data, size_t len) -> bool {
if (memchr(data, '\n', len))
{
ESP_LOG_BUFFER_HEXDUMP("esp-modem: debug_data", data, len, ESP_LOG_DEBUG);
const auto pass = std::list<std::string_view>({"NO CARRIER", "DISCONNECTED"});
std::string_view response((char *) data, len);
for (auto &it : pass)
if (response.find(it) != std::string::npos) {
if (auto signal = weak_signal.lock()) {
signal->set(1);
}
return true;
}
}
return false;
});
netif.wait_until_ppp_exits();
if (!signal->wait(1, 2000)) {
if (!device->set_mode(modem_mode::COMMAND_MODE)) {
mode = modem_mode::UNDEF;
return false;
}
}
dte->set_read_cb(nullptr);
if (!dte->set_mode(modem_mode::COMMAND_MODE)) {
if (!transitions::exit_data(*dte, *device, netif)) {
mode = modem_mode::UNDEF;
return false;
}
mode = m;
return true;
}
break;
case modem_mode::DATA_MODE:
if (mode == modem_mode::DATA_MODE || mode == modem_mode::CMUX_MODE) {
return false;
}
if (!device->setup_data_mode()) {
if (mode == modem_mode::DATA_MODE || mode == modem_mode::CMUX_MODE || mode >= modem_mode::CMUX_MANUAL_MODE) {
return false;
}
if (!device->set_mode(modem_mode::DATA_MODE)) {
if (!transitions::enter_data(*dte, *device, netif)) {
return false;
}
if (!dte->set_mode(modem_mode::DATA_MODE)) {
return false;
}
netif.start();
mode = m;
return true;
case modem_mode::CMUX_MODE:
if (mode == modem_mode::DATA_MODE || mode == modem_mode::CMUX_MODE) {
if (mode == modem_mode::DATA_MODE || mode == modem_mode::CMUX_MODE || mode >= modem_mode::CMUX_MANUAL_MODE) {
return false;
}
device->set_mode(modem_mode::CMUX_MODE); // switch the device into CMUX mode
Expand All @@ -111,17 +128,46 @@ bool DCE_Mode::set_unsafe(DTE *dte, ModuleIf *device, Netif &netif, modem_mode m
return false;
}
mode = modem_mode::CMUX_MODE;
if (!device->setup_data_mode()) {
return transitions::enter_data(*dte, *device, netif);
case modem_mode::CMUX_MANUAL_MODE:
if (mode != modem_mode::COMMAND_MODE) {
return false;
}
device->set_mode(modem_mode::CMUX_MODE);
usleep(100'000);

if (!dte->set_mode(m)) {
return false;
}
if (!device->set_mode(modem_mode::DATA_MODE)) {
mode = modem_mode::CMUX_MANUAL_MODE;
return true;
case modem_mode::CMUX_MANUAL_EXIT:
if (mode != modem_mode::CMUX_MANUAL_MODE) {
return false;
}
if (!dte->set_mode(m)) {
return false;
}
mode = modem_mode::COMMAND_MODE;
return true;
case modem_mode::CMUX_MANUAL_SWAP:
if (mode != modem_mode::CMUX_MANUAL_MODE) {
return false;
}
if (!dte->set_mode(modem_mode::DATA_MODE)) {
if (!dte->set_mode(m)) {
return false;
}
netif.start();
return true;
case modem_mode::CMUX_MANUAL_DATA:
if (mode != modem_mode::CMUX_MANUAL_MODE) {
return false;
}
return transitions::enter_data(*dte, *device, netif);
case modem_mode::CMUX_MANUAL_COMMAND:
if (mode != modem_mode::CMUX_MANUAL_MODE) {
return false;
}
return transitions::exit_data(*dte, *device, netif);
}
return false;
}
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