Add sendraw.c to test directory

https://github.com/Hamlib/Hamlib/issues/1157

tests/sendraw.c

@@ -0,0 +1,34 @@
+/* should work with simts2000 emulator */
+#include <stdio.h>
+#include <stdlib.h>
+#include <hamlib/rig.h>
+
+int
+main()
+{
+    RIG *my_rig;
+    unsigned char sendCmd[] = "FA;";
+    int sendCmdLen = 3;
+    unsigned char term[] = ";";
+    unsigned char rcvdCmd[100];
+    int rcvdCmdLen = sizeof(rcvdCmd);
+    int retcode;
+
+    my_rig = rig_init(2048);
+    strcpy(my_rig->state.rigport.pathname, "/dev/pts/4");
+
+    retcode = rig_open(my_rig);
+
+    if (retcode != RIG_OK)
+    {
+        printf("rig_open: error = %s\n", rigerror(retcode));
+        exit(2);
+    }
+    freq_t f;
+    rig_get_freq(my_rig, RIG_VFO_A, &f);
+
+    int nbytes = rig_send_raw(my_rig, sendCmd, sendCmdLen, rcvdCmd, rcvdCmdLen, term);
+    if (nbytes >= 0) printf("Response(%d bytes): %s\n", nbytes, rcvdCmd);
+    else printf("Error occurred = %s\n", rigerror(retcode));
+    return retcode;
+}