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+
+# improvements, compared to the osmocom sources
+
+
+## versions
+
+comparing osmocom's git git://git.osmocom.org/rtl-sdr.git dated from 2020-08-19
+against librtlsdr's development branch (same date)
+
+
+## "Driver" Library Features
+
+* added support for special USB (vendor) VID 0x1209 (product) PID 0x2832: "Generic RTL2832U":
+  * A special USB vendor/product id got reserved at http://pid.codes/1209/2832/
+  * for such devices the linux kernel's DVB modules are not loaded automatically, thus can be used without blacklisting dvb_usb_rtl28xxu below /etc/modprobe.d/
+  * this allows to use a second RTL dongle for use with DVB in parallel
+  * the IDs can be programmed with 'rtl_eeprom -n' or 'rtl_eeprom -g realtek_sdr'
+  * see https://www.rtl-sdr.com/watching-dvb-t-tv-and-using-sdr-mode-at-the-same-time-with-two-rtl-sdrs/
+
+* added support for using RTLSDR-Dongle from remote - see rtl_rpcd
+
+* improvements for R820T/2 tuner
+  also see https://codingspirit.de/librtlsdr-driver.pdf
+  * added better bandwidth support
+    * added smaller bandwidths, improving selectivity:
+      290, 375, 420, 470, 600, 860, 950, 1100, 1300, 1500, 1600, 1750, 1950 kHz.
+      These are coarse measured values .. which might get adjusted in future.
+    * bandwidth filters utilize tuner's low- and highpass filters at IF
+  * added spectrum flipping (inside tuner) - and back in RTL2832
+    * the band edges (low/high-pass) have different steepness;
+      the steeper edge can be selected with the mixer sideband (rtlsdr_set_tuner_sideband()),
+      to achieve better attenuation depending on signal scenario
+  * added (automatic) control over VGA (variable gain amplifier)
+    * VGA gain (besides LNA and Mixer) can be utilized and set to automatic,
+      letting it controlled from RTL2832U.
+      Having all automatic (AGC) including activation of digital AGC in RTL2832
+      (rtlsdr_set_agc_mode()), oversteering effects got reduced (a lot).
+    * gain range now up to 100 dB
+  * deactivated "Filter extension under weak signal" for a stable filter characteristic
+  * added shifting of IF-center, to receive away from DC. See rtlsdr_set_tuner_band_center()
+
+* probably some more: it's highly probable, that this list is incomplete
+
+
+## "Driver" Library API
+
+* added rtlsdr_set_and_get_tuner_bandwidth(), which also delivers the bandwidth.
+ [ with rtlsdr_set_tuner_bandwidth() does not deliver the bandwidth ]
+
+* added rtlsdr_set_tuner_band_center(),  to set center of the filtered tuner band
+
+* added rtlsdr_set_tuner_sideband(), to set mixer sideband
+
+* added rtlsdr_set_tuner_gain_ext(), special for R820T/2 tuner
+
+* added rtlsdr_set_tuner_if_mode(), sets AGC modes in detail
+
+* added rtlsdr_set_ds_mode() including threshold frequency
+
+* added rtlsdr_ir_query()
+
+* added rtlsdr_set_opt_string() and rtlsdr_get_opt_help()
+ for configuration of 'driver' - especially from command line
+
+* added rtlsdr_set_tuner_i2c_register(), rtlsdr_get_tuner_i2c_register()
+ and rtlsdr_set_tuner_i2c_override()
+ exposing hacking of tuner-specific I2C registers
+
+* added rtlsdr_get_ver_id(),
+ to allow discrimination between osmocom library - or this fork
+
+* added rtlsdr_get_version()
+
+
+## Tools
+
+* added rtl_ir:
+ print received IR signals.
+  * requires the IR diode of an RTL-SDR - which might not exist!
+
+* added rtl_rpcd:
+ a Remote Procedure Call server for RTL-SDR dongles.
+  * for use, set environment variable "RTLSDR_RPC_IS_ENABLED"
+  * optionally set environment varibales "RTLSDR_RPC_SERV_ADDR"
+    and "RTLSDR_RPC_SERV_PORT". These default to "127.0.0.1" and "40000".
+  * requires cmake option WITH_RPC
+
+* added rtl_raw2wav:
+ save rtl_sdr or rtl_fm's output (pipe) into a wave file,
+ including some meta information like timestamp and frequency
+
+* added rtl_udp:
+ same as rtl_tcp - just using UDP instead of TCP
+
+* added rtl_wavestat:
+ display wave file meta information
+
+* added rtl_wavestream:
+ stream raw data (in specified format)
+
+
+
+## "Driver" Library's UDP-Server - only on Windows
+
+* enabled by cmake option PROVIDE_UDP_SERVER for tests. OFF by default
+
+* activated by rtlsdr_set_opt_string(): "port=1" or "port=<udp_port>",
+ default port number: 32323
+
+* purpose is to allow configuration at runtime with a simple text protocol, e.g. with netcat
+
+* for detailed protocol, see comment section in parse() of librtlsdr.c.
+ or look for sections with '#ifdef WITH_UDP_SERVER'
+
+
+
+## RTL_TCP TCP-PROTOCOL
+
+* allows non-GPL programs, e.g. QIRX, to utilize the RTLSDR stuff in a license compliant way
+
+* added several control functions in rtl_tcp, not existing in osmocom release:
+ UDP_ESTABLISH, UDP_TERMINATE, SET_I2C_TUNER_REGISTER, SET_I2C_TUNER_OVERRIDE,
+ SET_TUNER_BW_IF_CENTER, SET_TUNER_IF_MODE, SET_SIDEBAND, REPORT_I2C_REGS
+
+* control functions documented in rtl_tcp.h
+
+* (by default) control port number 1234, configurable via command-line-interface (CLI)
+
+* response(s) at +1 of control port: 1235, configurable via CLI
+
+* protocol details in protocol_rtl_tcp.txt
+