add rssi info, reset stored enhanced infos when device was reset

docs/enhanced_proto.md

@@ -139,3 +139,6 @@ The first byte transferred in response is always the number of data bytes to be
    * `length`: =2
    * `reset_cause`: reset cause (1=power-on, 2=brown-out, 3=watchdog, 4=clear, 5=reset, 6=stack, 7=memory)
    * `restart_count`: restart count (within same power cycle)
+ * 0x07: WIFI status (since 20231226)
+   * `length`: =2
+   * `rssi`: signal strength in dBm (rssi, usually negative), 0 if unknown

src/lib/ebus/device.cpp

@@ -266,6 +266,12 @@ string EnhancedCharDevice::getEnhancedInfos() {
   if (res != RESULT_OK) {
     fails += ", cannot request bus voltage";
   }
+  if (m_enhInfoIsWifi) {
+    res = requestEnhancedInfo(7);
+    if (res != RESULT_OK) {
+      fails += ", cannot request rssi";
+    }
+  }
   res = requestEnhancedInfo(0xff);  // wait for completion
   if (res != RESULT_OK) {
     m_enhInfoBusVoltage = "bus voltage unknown";
@@ -360,6 +366,11 @@ result_t EnhancedCharDevice::notifyTransportStatus(bool opened) {
     // reset state
     m_extraFatures = 0;
     m_infoLen = 0;
+    m_enhInfoVersion = "";
+    m_enhInfoIsWifi = false;
+    m_enhInfoTemperature = "";
+    m_enhInfoSupplyVoltage = "";
+    m_enhInfoBusVoltage = "";
     m_arbitrationMaster = SYN;
     m_arbitrationCheck = 0;
   }
@@ -548,6 +559,7 @@ void EnhancedCharDevice::notifyInfoRetrieved() {
       stream << "firmware " << m_enhInfoVersion;
       if (len >= 5) {
         stream << ", jumpers 0x" << setw(2) << static_cast<unsigned>(data[4]);
+        m_enhInfoIsWifi = (data[4]&0x08)!=0;
       }
       stream << setfill(' ');  // reset
       break;
@@ -610,6 +622,14 @@ void EnhancedCharDevice::notifyInfoRetrieved() {
         stream << "unknown";
       }
       break;
+    case 0x0107:
+      stream << "rssi ";
+      if (data[0]) {
+        stream << static_cast<signed>(((int8_t*)data)[0]) << " dBm";
+      } else {
+        stream << "unknown";
+      }
+      break;
     default:
       stream << "unknown 0x" << hex << setfill('0') << setw(2)
              << static_cast<unsigned>(id) << ", len " << dec << setw(0)

src/lib/ebus/device.h

@@ -252,7 +252,7 @@ class EnhancedCharDevice : public CharDevice {
    */
   explicit EnhancedCharDevice(Transport* transport)
   : CharDevice(transport), m_resetRequested(false),
-    m_extraFatures(0), m_infoReqTime(0), m_infoLen(0), m_infoPos(0) {
+    m_extraFatures(0), m_infoReqTime(0), m_infoLen(0), m_infoPos(0), m_enhInfoIsWifi(false) {
   }
 
   // @copydoc
@@ -340,6 +340,9 @@ class EnhancedCharDevice : public CharDevice {
   /** a string describing the enhanced device version. */
   string m_enhInfoVersion;
 
+  /** whether the device is known to be connected via WIFI. */
+  bool m_enhInfoIsWifi;
+
   /** a string describing the enhanced device temperature. */
   string m_enhInfoTemperature;