diff --git a/src/main.rs b/src/main.rs
index 8882056..eb58ab3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -615,7 +615,6 @@ fn handle_frame(frame: esp_radio::wifi::sniffer::PromiscuousPkt<'_>) {
     }
 
     // info!("Received frame with {} bytes", frame.len);
-    esp_println::print!("."); // TODO: debug only!
     unsafe {
         #[allow(static_mut_refs)]
         if let Some(ref mut led) = USER_LED.as_mut() {
@@ -636,6 +635,7 @@ fn handle_frame(frame: esp_radio::wifi::sniffer::PromiscuousPkt<'_>) {
         Ok(packet) => {
             // drop hopped (for now)
             if packet.decoded.is_hopped() {
+                esp_println::print!("."); // TODO: debug only!
                 return;
             }
 
@@ -644,9 +644,15 @@ fn handle_frame(frame: esp_radio::wifi::sniffer::PromiscuousPkt<'_>) {
                 // drop all unsupported message IDs and rate-limit SPATEMs
                 if match message_id {
                     #[cfg(feature = "denm")]
-                    c_its_parser::standards::extensions::ItsMessageId::Denm => false,
+                    c_its_parser::standards::extensions::ItsMessageId::Denm => {
+                        esp_println::print!("D"); // TODO: debug only!
+                        false
+                    }
                     #[cfg(feature = "cam")]
-                    c_its_parser::standards::extensions::ItsMessageId::Cam => false,
+                    c_its_parser::standards::extensions::ItsMessageId::Cam => {
+                        esp_println::print!("C"); // TODO: debug only!
+                        false
+                    }
                     #[cfg(feature = "spat")]
                     c_its_parser::standards::extensions::ItsMessageId::Spatem => {
                         // reduce SPAT rate per station ID
@@ -662,7 +668,10 @@ fn handle_frame(frame: esp_radio::wifi::sniffer::PromiscuousPkt<'_>) {
                                 i.msg_count = i.msg_count.wrapping_add(1);
 
                                 if (i.msg_count % SPAT_RATE_LIMIT) > 0 {
+                                    esp_println::print!("s"); // TODO: debug only!
                                     drop_msg = true;
+                                } else {
+                                    esp_println::print!("S"); // TODO: debug only!
                                 }
                             });
                         }
@@ -670,8 +679,14 @@ fn handle_frame(frame: esp_radio::wifi::sniffer::PromiscuousPkt<'_>) {
                         drop_msg
                     }
                     #[cfg(feature = "spat")]
-                    c_its_parser::standards::extensions::ItsMessageId::Mapem => false,
-                    _ => true,
+                    c_its_parser::standards::extensions::ItsMessageId::Mapem => {
+                        esp_println::print!("M"); // TODO: debug only!
+                        false
+                    }
+                    _ => {
+                        esp_println::print!("?"); // TODO: debug only!
+                        true
+                    }
                 } {
                     return;
                 }