Leaving this here in case someone ever needs int :-)

arch/esp32/esp32c3.ini

@@ -0,0 +1,46 @@
+[esp32c3_base]
+extends = arduino_base
+platform = platformio/espressif32@^6.0.0
+build_src_filter = 
+  ${arduino_base.build_src_filter} -<platform/nrf52/> -<platform/stm32wl> -<platform/rp2040> -<mesh/eth/>
+upload_speed = 961200
+monitor_speed = 115200
+debug_init_break = tbreak setup
+monitor_filters = esp32_exception_decoder
+board_build.filesystem = littlefs
+
+# Remove -DMYNEWT_VAL_BLE_HS_LOG_LVL=LOG_LEVEL_CRITICAL for low level BLE logging.
+# See library directory for BLE logging possible values: .pio/libdeps/tbeam/NimBLE-Arduino/src/log_common/log_common.h
+# This overrides the BLE logging default of LOG_LEVEL_INFO (1) from: .pio/libdeps/tbeam/NimBLE-Arduino/src/esp_nimble_cfg.h
+build_flags =
+  ${arduino_base.build_flags} 
+  -Wall 
+  -Wextra 
+  -Isrc/platform/esp32 
+  -std=c++11 
+  -DLOG_LOCAL_LEVEL=ESP_LOG_DEBUG 
+  -DCORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_DEBUG 
+  -DMYNEWT_VAL_BLE_HS_LOG_LVL=LOG_LEVEL_CRITICAL
+  -DAXP_DEBUG_PORT=Serial 
+  -DCONFIG_BT_NIMBLE_ENABLED 
+  -DCONFIG_NIMBLE_CPP_LOG_LEVEL=2
+  -DCONFIG_BT_NIMBLE_MAX_CCCDS=20
+  -DESP_OPENSSL_SUPPRESS_LEGACY_WARNING
+  ;-DDEBUG_HEAP
+  
+lib_deps =
+  ${arduino_base.lib_deps}
+  ${networking_base.lib_deps}
+  ${environmental_base.lib_deps}
+  https://github.com/meshtastic/esp32_https_server.git#23665b3adc080a311dcbb586ed5941b5f94d6ea2
+  h2zero/NimBLE-Arduino@^1.4.0
+  https://github.com/lewisxhe/XPowersLib.git#84b7373faea3118b6c37954d52f98b8a337148d6
+  caveman99/ESP32 Codec2@^1.0.1
+
+lib_ignore = 
+  segger_rtt
+  ESP32 BLE Arduino
+
+; customize the partition table
+; http://docs.platformio.org/en/latest/platforms/espressif32.html#partition-tables
+board_build.partitions = partition-table.csv

src/mesh/http/ContentHandler.cpp

@@ -833,7 +833,7 @@ void handleScanNetworks(HTTPRequest *req, HTTPResponse *res)
             if (WiFi.encryptionType(i) != WIFI_AUTH_OPEN) {
                 JSONObject thisNetwork;
                 thisNetwork["ssid"] = new JSONValue(ssidArray);
-                thisNetwork["rssi"] = new JSONValue(WiFi.RSSI(i));
+                thisNetwork["rssi"] = new JSONValue(int(WiFi.RSSI(i)));
                 networkObjs.push_back(new JSONValue(thisNetwork));
             }
             // Yield some cpu cycles to IP stack.

src/modules/Modules.cpp

@@ -72,7 +72,7 @@ void setupModules()
             new AirQualityTelemetryModule();
         }
 #endif
-#if (defined(ARCH_ESP32) || defined(ARCH_NRF52)) && !defined(TTGO_T_ECHO) && !defined(CONFIG_IDF_TARGET_ESP32S2)
+#if (defined(ARCH_ESP32) || defined(ARCH_NRF52)) && !defined(TTGO_T_ECHO) && !defined(CONFIG_IDF_TARGET_ESP32S2) &&!defined(CONFIG_IDF_TARGET_ESP32C3)
         new SerialModule();
 #endif
 #ifdef ARCH_ESP32

src/modules/SerialModule.cpp

@@ -44,7 +44,7 @@
 
 */
 
-#if (defined(ARCH_ESP32) || defined(ARCH_NRF52)) && !defined(TTGO_T_ECHO) && !defined(CONFIG_IDF_TARGET_ESP32S2)
+#if (defined(ARCH_ESP32) || defined(ARCH_NRF52)) && !defined(TTGO_T_ECHO) && !defined(CONFIG_IDF_TARGET_ESP32S2) && !defined(CONFIG_IDF_TARGET_ESP32C3)
 
 #define RX_BUFFER 128
 #define TIMEOUT 250

src/modules/SerialModule.h

@@ -8,7 +8,7 @@
 #include <Arduino.h>
 #include <functional>
 
-#if (defined(ARCH_ESP32) || defined(ARCH_NRF52)) && !defined(TTGO_T_ECHO) && !defined(CONFIG_IDF_TARGET_ESP32S2)
+#if (defined(ARCH_ESP32) || defined(ARCH_NRF52)) && !defined(TTGO_T_ECHO) && !defined(CONFIG_IDF_TARGET_ESP32S2) && !defined(CONFIG_IDF_TARGET_ESP32C3)
 
 class SerialModule : public StreamAPI, private concurrency::OSThread
 {

src/platform/esp32/main-esp32.cpp

@@ -178,6 +178,7 @@ void cpuDeepSleep(uint64_t msecToWake)
 
     Note: we don't isolate pins that are used for the LORA, LED, i2c, spi or the wake button
     */
+#if SOC_RTCIO_HOLD_SUPPORTED   
     static const uint8_t rtcGpios[] = {/* 0, */ 2,
     /* 4, */
 #ifndef USE_JTAG
@@ -189,8 +190,10 @@ void cpuDeepSleep(uint64_t msecToWake)
                                        36,           37
                                        /* 38, 39 */};
 
+
     for (int i = 0; i < sizeof(rtcGpios); i++)
         rtc_gpio_isolate((gpio_num_t)rtcGpios[i]);
+#endif
 
     // FIXME, disable internal rtc pullups/pulldowns on the non isolated pins. for inputs that we aren't using
     // to detect wake and in normal operation the external part drives them hard.
@@ -200,7 +203,9 @@ void cpuDeepSleep(uint64_t msecToWake)
 
 #ifdef BUTTON_PIN
     // Only GPIOs which are have RTC functionality can be used in this bit map: 0,2,4,12-15,25-27,32-39.
+#if SOC_RTCIO_HOLD_SUPPORTED
     uint64_t gpioMask = (1ULL << BUTTON_PIN);
+#endif
 
 #ifdef BUTTON_NEED_PULLUP
     gpio_pullup_en((gpio_num_t)BUTTON_PIN);
@@ -210,7 +215,9 @@ void cpuDeepSleep(uint64_t msecToWake)
     // FIXME change polarity in hw so we can wake on ANY_HIGH instead - that would allow us to use all three buttons (instead of
     // just the first) gpio_pullup_en((gpio_num_t)BUTTON_PIN);
 
+#if SOC_PM_SUPPORT_EXT_WAKEUP
     esp_sleep_enable_ext1_wakeup(gpioMask, ESP_EXT1_WAKEUP_ALL_LOW);
+#endif
 #endif
 
     esp_sleep_enable_timer_wakeup(msecToWake * 1000ULL); // call expects usecs

src/sleep.cpp

@@ -337,6 +337,8 @@ void enableModemSleep()
     esp32_config.max_freq_mhz = CONFIG_ESP32S3_DEFAULT_CPU_FREQ_MHZ;
 #elif CONFIG_IDF_TARGET_ESP32S2
     esp32_config.max_freq_mhz = CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ;
+#elif CONFIG_IDF_TARGET_ESP32C3
+    esp32_config.max_freq_mhz = CONFIG_ESP32C3_DEFAULT_CPU_FREQ_MHZ;
 #else
     esp32_config.max_freq_mhz = CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ;
 #endif