Rework test mode to use normal LoRa batching and ACK flow

src/receiver_pipeline.cpp

@@ -6,6 +6,7 @@
 
 #include "config.h"
 #include "display_ui.h"
+#include "json_codec.h"
 #include "lora_transport.h"
 #include "mqtt_client.h"
 #include "payload_codec.h"
@@ -77,6 +78,18 @@ static uint8_t bit_count32(uint32_t value) {
   return count;
 }
 
+static bool mqtt_publish_sample(const MeterData &data) {
+#ifdef ENABLE_TEST_MODE
+  String payload;
+  if (!meterDataToJson(data, payload)) {
+    return false;
+  }
+  return mqtt_publish_test(data.device_id, payload);
+#else
+  return mqtt_publish_state(data);
+#endif
+}
+
 struct BatchRxState {
   bool active;
   uint16_t batch_id;
@@ -470,7 +483,7 @@ static void receiver_loop() {
 
         web_server_set_last_batch(static_cast<uint8_t>(sender_idx), samples, count);
         for (size_t s = 0; s < count; ++s) {
-          mqtt_publish_state(samples[s]);
+          mqtt_publish_sample(samples[s]);
         }
         g_sender_statuses[sender_idx].last_data = samples[count - 1];
         g_sender_statuses[sender_idx].last_update_ts_utc = samples[count - 1].ts_utc;