Merge pull request espressif#391 from david-cermak/fix/modem_usb_dte

[esp-modem]: Added USB runner with ESP32S2 with A7670

Author: david-cermak

.github/workflows/modem__target-test.yml

@@ -16,6 +16,10 @@ jobs:
         idf_ver: ["latest"]
         idf_target: ["esp32c3"]
         test: [ { app: pppd, path: test/target }, { app: sim800_c3, path: examples/pppos_client }, { app: sim800_cmux, path: examples/simple_cmux_client } ]
+        include:
+          - idf_ver: "latest"
+            idf_target: "esp32s2"
+            test: { app: usb_a7670_s2, path: examples/pppos_client }
     runs-on: ubuntu-20.04
     container: espressif/idf:${{ matrix.idf_ver }}
     env:
@@ -55,6 +59,10 @@ jobs:
         idf_ver: ["latest"]
         idf_target: ["esp32c3"]
         test: [ { app: pppd, path: test/target }, { app: sim800_c3, path: examples/pppos_client }, { app: sim800_cmux, path: examples/simple_cmux_client } ]
+        include:
+          - idf_ver: "latest"
+            idf_target: "esp32s2"
+            test: { app: usb_a7670_s2, path: examples/pppos_client }
     needs: build_esp_modem_tests
     runs-on:
       - self-hosted

components/esp_modem/examples/pppos_client/sdkconfig.ci.usb_a7670_s2

@@ -0,0 +1,14 @@
+CONFIG_IDF_TARGET="esp32s2"
+# Override some defaults to enable PPP
+CONFIG_LWIP_PPP_SUPPORT=y
+CONFIG_LWIP_PPP_NOTIFY_PHASE_SUPPORT=y
+CONFIG_LWIP_PPP_PAP_SUPPORT=y
+CONFIG_LWIP_TCPIP_TASK_STACK_SIZE=4096
+CONFIG_LWIP_PPP_ENABLE_IPV6=n
+CONFIG_EXAMPLE_SERIAL_CONFIG_USB=y
+CONFIG_EXAMPLE_MODEM_DEVICE_A7670=y
+CONFIG_EXAMPLE_MODEM_PPP_APN="lpwa.vodafone.com"
+CONFIG_EXAMPLE_MODEM_PPP_AUTH_NONE=y
+CONFIG_EXAMPLE_MQTT_TEST_TOPIC="/ci/esp-modem/pppos-client"
+CONFIG_ESP_SYSTEM_PANIC_PRINT_HALT=y
+CONFIG_ESP32_PANIC_PRINT_HALT=y

components/esp_modem/src/esp_modem_dte.cpp

@@ -78,9 +78,9 @@ void DTE::set_command_callbacks()
             if (command_cb.process_line(data, 0, len)) {
                 return true;
             }
-            // cannot inflate and the processing hasn't finishes in the first iteration -> report a failure
-            command_cb.give_up();
-            return true;
+            // cannot inflate and the processing hasn't finishes in the first iteration, but continue
+            // (will post next fragments to the parser, since we might be just missing a last token or OK
+            return false;
 #endif
         }
         // data == nullptr: Terminals which request users to read current data