During icom power on 0xfe may get echoed after power on so ensure we look for it and remove it

https://github.com/Hamlib/Hamlib/issues/900

rigs/icom/frame.c

@@ -199,6 +199,16 @@ int icom_one_transaction(RIG *rig, unsigned char cmd, int subcmd,
             set_transaction_inactive(rig);
             RETURNFUNC(-RIG_EPROTO);
         }
+        // we might have 0xfe string during rig wakeup
+        if (retval != frm_len && cmd == C_SET_PWR)
+        {
+            rig_debug(RIG_DEBUG_TRACE, "%s: removing 0xfe power up echo, len=%d", __func__, frm_len);
+            while(buf[2] == 0xfe)
+            {
+                memmove(buf,&buf[1],frm_len--);
+            }
+            dump_hex(buf,frm_len);
+        }
 
         switch (buf[retval - 1])
         {

rigs/icom/frame.h

@@ -22,7 +22,8 @@
 #ifndef _FRAME_H
 #define _FRAME_H 1
 
-#define MAXFRAMELEN 80
+// Has to be big enough for 0xfe sequence to wake up rig
+#define MAXFRAMELEN 200
 
 /*
  * helper functions

rigs/icom/icom.c

@@ -7762,8 +7762,6 @@ int icom_set_powerstat(RIG *rig, powerstat_t status)
         memset(fe_buf, 0xfe, fe_max);
         // sending more than enough 0xfe's to wake up the rs232
         write_block(&rs->rigport, fe_buf, fe_max);
-        hl_usleep(200*1000); // short sleep
-        rig_flush(&rs->rigport); // flush any echo of 0xFE
 
         // we'll try 0x18 0x01 now -- should work on STBY rigs too
         pwr_sc = S_PWR_ON;
@@ -7771,7 +7769,6 @@ int icom_set_powerstat(RIG *rig, powerstat_t status)
         priv->serial_USB_echo_off = 1;
         retval =
             icom_transaction(rig, C_SET_PWR, pwr_sc, NULL, 0, ackbuf, &ack_len);
-        hl_usleep(4000 * 1000); // give some time to wake up
 
         break;