Try to fix IC-7100 remote operation echo oddity

https://github.com/Hamlib/Hamlib/issues/1575

rigs/icom/frame.c

@@ -221,6 +221,10 @@ again1:
             rig_debug(RIG_DEBUG_VERBOSE, "%s: subcmd x%02d != buf x%02x so retry read\n", __func__, subcmd, buf[5]);
             goto again1;
         }
+        if (sendbuf[3] != buf[2]) { // then the reply controller addr is not the same so skip it
+            rig_debug(RIG_DEBUG_VERBOSE, "%s: subcmd x%02d != buf x%02x so retry read\n", __func__, subcmd, buf[5]);
+            goto again1;
+        }
 
         // we might have 0xfe string during rig wakeup
         rig_debug(RIG_DEBUG_TRACE, "%s: DEBUG retval=%d, frm_len=%d, cmd=0x%02x\n",

rigs/icom/icom.c

@@ -8970,8 +8970,7 @@ int icom_is_async_frame(RIG *rig, size_t frame_length,
     }
 
     /* Spectrum scope data is not CI-V transceive data, but handled the same way as it is pushed by the rig */
-    // IC-7100 sends 0xe1 for broadcast frame?
-    return frame[2] == 0xe1 || frame[2] == BCASTID || (frame[2] == CTRLID && frame[4] == C_CTL_SCP
+    return frame[2] == BCASTID || (frame[2] == CTRLID && frame[4] == C_CTL_SCP
                                    && frame[5] == S_SCP_DAT);
 }
 

rigs/icom/icom.h

@@ -35,7 +35,7 @@
 #include <sys/time.h>
 #endif
 
-#define BACKEND_VER "20240717"
+#define BACKEND_VER "20240722"
 
 #define ICOM_IS_ID31 rig_is_model(rig, RIG_MODEL_ID31)
 #define ICOM_IS_ID51 rig_is_model(rig, RIG_MODEL_ID51)