Improve power saving and payload safety

src/main.cpp

@@ -134,7 +134,10 @@ static void receiver_loop() {
   if (lora_receive(pkt, 0) && pkt.protocol_version == PROTOCOL_VERSION && pkt.payload_type == PayloadType::MeterData) {
     uint8_t decompressed[256];
     size_t decompressed_len = 0;
-    if (decompressBuffer(pkt.payload, pkt.payload_len, decompressed, sizeof(decompressed), decompressed_len)) {
+    if (decompressBuffer(pkt.payload, pkt.payload_len, decompressed, sizeof(decompressed) - 1, decompressed_len)) {
+      if (decompressed_len >= sizeof(decompressed)) {
+        return;
+      }
       decompressed[decompressed_len] = '\0';
       MeterData data = {};
       if (jsonToMeterData(String(reinterpret_cast<const char *>(decompressed)), data)) {

src/power_manager.cpp

@@ -17,6 +17,7 @@ void power_sender_init() {
 }
 
 void power_receiver_init() {
+  btStop();
   analogReadResolution(12);
   pinMode(PIN_BAT_ADC, INPUT);
 }

src/test_mode.cpp

@@ -95,7 +95,10 @@ void test_receiver_loop(SenderStatus *statuses, uint8_t count, uint16_t self_sho
 
   uint8_t decompressed[160];
   size_t decompressed_len = 0;
-  if (!decompressBuffer(pkt.payload, pkt.payload_len, decompressed, sizeof(decompressed), decompressed_len)) {
+  if (!decompressBuffer(pkt.payload, pkt.payload_len, decompressed, sizeof(decompressed) - 1, decompressed_len)) {
+    return;
+  }
+  if (decompressed_len >= sizeof(decompressed)) {
     return;
   }
   decompressed[decompressed_len] = '\0';

src/wifi_manager.cpp

@@ -1,5 +1,6 @@
 #include "wifi_manager.h"
 #include <WiFi.h>
+#include <esp_wifi.h>
 
 static Preferences prefs;
 
@@ -43,7 +44,11 @@ bool wifi_connect_sta(const WifiMqttConfig &config, uint32_t timeout_ms) {
   while (WiFi.status() != WL_CONNECTED && millis() - start < timeout_ms) {
     delay(200);
   }
-  return WiFi.status() == WL_CONNECTED;
+  bool connected = WiFi.status() == WL_CONNECTED;
+  if (connected) {
+    esp_wifi_set_ps(WIFI_PS_MIN_MODEM);
+  }
+  return connected;
 }
 
 void wifi_start_ap(const char *ap_ssid, const char *ap_pass) {