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	add help message to rtl_tcp spectrum server
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		@@ -354,7 +354,6 @@ int main(int argc, char **argv)
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	if (argc < optind)
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		usage();
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#else
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	if(argc < 6)
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		usage();
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@@ -364,8 +363,6 @@ int main(int argc, char **argv)
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	port = atoi(argv[2]);
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	addr = argv[1];
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#endif
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	printf("listen addr %s:%d\n", addr, port);
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	device_count = rtlsdr_get_device_count();
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	if (!device_count) {
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		fprintf(stderr, "No supported devices found.\n");
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@@ -440,6 +437,11 @@ int main(int argc, char **argv)
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	while(1) {
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		printf("listening...\n");
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		printf("Use the device argument 'rtl_tcp=%s:%d' in OsmoSDR "
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		       "(gr-osmosdr) source\n"
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		       "to receive samples in GRC and control "
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		       "rtl_tcp parameters (frequency, gain, ...).\n",
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		       addr, port);
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		listen(listensocket,1);
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		while(1) {
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