|   | 1 | == Basic usage == | 
          
          
            |   | 2 |  | 
          
          
            |   | 3 | === Desciption === | 
          
          
            |   | 4 | In this tutorial we'll demonstrate how to navigate from the COSMOS sandbox to a single SDR on a node and run an application to read samples from the SDR. | 
          
          
            |   | 5 |  | 
          
          
            |   | 6 | === Prerequisites === | 
          
          
            |   | 7 | Before getting started you'll need the following: | 
          
          
            |   | 8 |  1. sign up for a [https://cosmos-lab.org/portal-2/ COSMOS account] | 
          
          
            |   | 9 |  2. create a reservation for sandbox 1 using the [https://wiki.cosmos-lab.org/cPanel/controlPanel/start scheduler]. | 
          
          
            |   | 10 |  3. some minimal knowledge or interest of Linux | 
          
          
            |   | 11 |  | 
          
          
            |   | 12 | === Set up === | 
          
          
            |   | 13 |  * After your reservation request has been approved, you'll receive access to the sandbox1 console. | 
          
          
            |   | 14 | Open a terminal into console.sb1.cosmos-lab.org with a tunnel set up from localhost:5000 to srv1-lg1.sb1.cosmos-lab.org:9002 | 
          
          
            |   | 15 | {{{ | 
          
          
            |   | 16 |                                        Welcome to | 
          
          
            |   | 17 |    _____ ____   _____ __  __  ____   _____      _               ____ | 
          
          
            |   | 18 |   / ____/ __ \ / ____|  \/  |/ __ \ / ____|    | |        /\   |  _ \ | 
          
          
            |   | 19 |  | |   | |  | | (___ | \  / | |  | | (___ _____| |       /  \  | |_) | ___  _ __ __ _ | 
          
          
            |   | 20 |  | |   | |  | |\___ \| |\/| | |  | |\___ \_____| |      / /\ \ |  _ < / _ \| '__/ _` | | 
          
          
            |   | 21 |  | |___| |__| |____) | |  | | |__| |____) |    | |____ / ____ \| |_) | (_) | | | (_| | | 
          
          
            |   | 22 |   \_____\____/|_____/|_|  |_|\____/|_____/     |______/_/    \_\____(_)___/|_|  \__, | | 
          
          
            |   | 23 |                                                                                  __/ | | 
          
          
            |   | 24 |                                                                                 |___/ | 
          
          
            |   | 25 |  Hostname         : console.sb1.cosmos-lab.org | 
          
          
            |   | 26 |  Operating system : Ubuntu 16.04.5 LTS; Kernel: 4.15.0-45-generic; Arch: x86_64; | 
          
          
            |   | 27 |  CPU              : 6 x Intel(R) Xeon(R) CPU E5-2630 v2 @ 2.60GHz | 
          
          
            |   | 28 |                     1 socket(s) with 6 core(s) per socket and 1 thread(s) per core | 
          
          
            |   | 29 |  Memory           : 3.9G | 
          
          
            |   | 30 |  Uptime           : up 4 days, 14 hours, 15 minutes | 
          
          
            |   | 31 |  Users logged in  : 0 | 
          
          
            |   | 32 | Last login: Tue Feb 26 19:06:09 2019 from 165.230.132.125 | 
          
          
            |   | 33 | }}} | 
          
          
            |   | 34 |  | 
          
          
            |   | 35 |  * We can see the available nodes under this sandbox using the ''omf stat -t all'' command. The nodes list below should coinside with the [https://wiki.cosmos-lab.org/cPanel/controlPanel/start Inventory/Status page]. | 
          
          
            |   | 36 | {{{ | 
          
          
            |   | 37 | nilanjan@console:~$ omf stat -t all | 
          
          
            |   | 38 |  | 
          
          
            |   | 39 | ----------------------------------------------- | 
          
          
            |   | 40 |  Node: srv1-lg1.sb1.cosmos-lab.org       State: POWEROFF | 
          
          
            |   | 41 |  Node: srv2-lg1.sb1.cosmos-lab.org       State: POWEROFF | 
          
          
            |   | 42 | ----------------------------------------------- | 
          
          
            |   | 43 | }}} | 
          
          
            |   | 44 |  | 
          
          
            |   | 45 |  * For this example we'll use the node ''srv1-lg1.sb1.cosmos-lab.org'' and load the ''baseline-sdr.ndz'' image onto it. This image already has the applications pre-compiled and drivers installed. | 
          
          
            |   | 46 | {{{ | 
          
          
            |   | 47 | console:~$ omf load -i baseline-sdr.ndz  -t srv1-lg1.sb1.cosmos-lab.org | 
          
          
            |   | 48 | }}} | 
          
          
            |   | 49 |  After the image is successfully loaded turn on the node, give it some time to boot and then ssh into it. | 
          
          
            |   | 50 | {{{ | 
          
          
            |   | 51 | console:~$ omf tell -a on -t srv1-lg1.sb1.cosmos-lab.org | 
          
          
            |   | 52 | console:~$ ssh native@srv1-lg1.sb1.cosmos-lab.org | 
          
          
            |   | 53 | }}} | 
          
          
            |   | 54 |  | 
          
          
            |   | 55 |  * Once you're in ''srv1-lg1.sb1.cosmos-lab.org'' configure the network interface so it can talk to the N310's data interface. | 
          
          
            |   | 56 | {{{ | 
          
          
            |   | 57 | sudo ifconfig enp1s0 192.168.20.1 | 
          
          
            |   | 58 | }}} | 
          
          
            |   | 59 |  | 
          
          
            |   | 60 |  Run ''uhd_find_devices' and check if the N310 is detected | 
          
          
            |   | 61 | {{{ | 
          
          
            |   | 62 | native@localhost:~$ uhd_find_devices | 
          
          
            |   | 63 |  | 
          
          
            |   | 64 | [INFO] [UHD] linux; GNU C++ version 7.3.0; Boost_106501; UHD_3.13.1.0-0-unknown | 
          
          
            |   | 65 | -------------------------------------------------- | 
          
          
            |   | 66 | -- UHD Device 0 | 
          
          
            |   | 67 | -------------------------------------------------- | 
          
          
            |   | 68 | Device Address: | 
          
          
            |   | 69 |     serial: 315A35A | 
          
          
            |   | 70 |     addr: 192.168.20.2 | 
          
          
            |   | 71 |     claimed: False | 
          
          
            |   | 72 |     mgmt_addr: 10.110.1.3 | 
          
          
            |   | 73 |     mgmt_addr: 192.168.20.2 | 
          
          
            |   | 74 |     product: n310 | 
          
          
            |   | 75 |     type: n3xx | 
          
          
            |   | 76 | }}} | 
          
          
            |   | 77 |  | 
          
          
            |   | 78 |  We can also use ''uhd_usrp_probe'' to get more details. | 
          
          
            |   | 79 | {{{ | 
          
          
            |   | 80 | native@localhost:~$ uhd_usrp_probe --args="mgmt_addr=10.110.1.3,addr=192.168.20.2" | 
          
          
            |   | 81 | [INFO] [UHD] linux; GNU C++ version 7.3.0; Boost_106501; UHD_3.13.1.0-0-unknown | 
          
          
            |   | 82 | [INFO] [MPMD] Initializing 1 device(s) in parallel with args: mgmt_addr=10.110.1.3,type=n3xx,product=n310,serial=315A35A,claimed=False,addr=192.168.22 | 
          
          
            |   | 83 |  | 
          
          
            |   | 84 | [INFO] [0/DmaFIFO_0] Initializing block control (NOC ID: 0xF1F0D00000000004) | 
          
          
            |   | 85 | [INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1350 MB/s) | 
          
          
            |   | 86 | [INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1341 MB/s) | 
          
          
            |   | 87 | [INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1340 MB/s) | 
          
          
            |   | 88 | [INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1349 MB/s) | 
          
          
            |   | 89 | [INFO] [MPM.PeriphManager] init() called with device args `mgmt_addr=10.110.1.3,product=n310'. | 
          
          
            |   | 90 | [INFO] [0/Radio_0] Initializing block control (NOC ID: 0x12AD100000011312) | 
          
          
            |   | 91 | [INFO] [0/Radio_1] Initializing block control (NOC ID: 0x12AD100000011312) | 
          
          
            |   | 92 | [INFO] [0/DDC_0] Initializing block control (NOC ID: 0xDDC0000000000000) | 
          
          
            |   | 93 | [INFO] [0/DDC_1] Initializing block control (NOC ID: 0xDDC0000000000000) | 
          
          
            |   | 94 | [INFO] [0/DUC_0] Initializing block control (NOC ID: 0xD0C0000000000002) | 
          
          
            |   | 95 | [INFO] [0/DUC_1] Initializing block control (NOC ID: 0xD0C0000000000002) | 
          
          
            |   | 96 |   _____________________________________________________ | 
          
          
            |   | 97 |  / | 
          
          
            |   | 98 | |       Device: N300-Series Device | 
          
          
            |   | 99 | |     _____________________________________________________ | 
          
          
            |   | 100 | |    / | 
          
          
            |   | 101 | |   |       Mboard: ni-n3xx-315A35A | 
          
          
            |   | 102 | |   |   eeprom_version: 1 | 
          
          
            |   | 103 | |   |   pid: 16962 | 
          
          
            |   | 104 | |   |   product: n310 | 
          
          
            |   | 105 | |   |   rev: 5 | 
          
          
            |   | 106 | |   |   rpc_connection: remote | 
          
          
            |   | 107 | |   |   serial: 315A35A | 
          
          
            |   | 108 | |   |   type: n3xx | 
          
          
            |   | 109 | |   |   MPM Version: 1.2 | 
          
          
            |   | 110 | |   |   FPGA Version: 5.2 | 
          
          
            |   | 111 | |   |   FPGA git hash: UNKNOWN | 
          
          
            |   | 112 | |   |   RFNoC capable: Yes | 
          
          
            |   | 113 | |   | | 
          
          
            |   | 114 | |   |   Time sources:  internal, external, gpsdo, sfp0 | 
          
          
            |   | 115 | |   |   Clock sources: external, internal, gpsdo | 
          
          
            |   | 116 | |   |   Sensors: gps_locked, ref_locked, fan, get_gps_sky_sensor, temp, get_gps_time_sensor, get_gps_tpv_sensor | 
          
          
            |   | 117 | |   |     _____________________________________________________ | 
          
          
            |   | 118 | |   |    / | 
          
          
            |   | 119 | |   |   |       RX Dboard: A | 
          
          
            |   | 120 | |   |   |     _____________________________________________________ | 
          
          
            |   | 121 | |   |   |    / | 
          
          
            |   | 122 | |   |   |   |       RX Frontend: 0 | 
          
          
            |   | 123 | |   |   |   |   Name: Magnesium | 
          
          
            |   | 124 | |   |   |   |   Antennas: TX/RX, RX2, CAL, LOCAL | 
          
          
            |   | 125 | |   |   |   |   Sensors: lo_locked, ad9371_lo_locked, lowband_lo_locked | 
          
          
            |   | 126 | |   |   |   |   Freq range: 1.000 to 6000.000 MHz | 
          
          
            |   | 127 | |   |   |   |   Gain range all: 0.0 to 75.0 step 0.5 dB | 
          
          
            |   | 128 | |   |   |   |   Gain range rfic: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 129 | |   |   |   |   Gain range dsa: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 130 | |   |   |   |   Gain range amp: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 131 | |   |   |   |   Bandwidth range: 20000000.0 to 100000000.0 step 0.0 Hz | 
          
          
            |   | 132 | |   |   |   |   Connection Type: IQ | 
          
          
            |   | 133 | |   |   |   |   Uses LO offset: No | 
          
          
            |   | 134 | |   |   |     _____________________________________________________ | 
          
          
            |   | 135 | |   |   |    / | 
          
          
            |   | 136 | |   |   |   |       RX Frontend: 1 | 
          
          
            |   | 137 | |   |   |   |   Name: Magnesium | 
          
          
            |   | 138 | |   |   |   |   Antennas: TX/RX, RX2, CAL, LOCAL | 
          
          
            |   | 139 | |   |   |   |   Sensors: lo_locked, ad9371_lo_locked, lowband_lo_locked | 
          
          
            |   | 140 | |   |   |   |   Freq range: 1.000 to 6000.000 MHz | 
          
          
            |   | 141 | |   |   |   |   Gain range all: 0.0 to 75.0 step 0.5 dB | 
          
          
            |   | 142 | |   |   |   |   Gain range rfic: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 143 | |   |   |   |   Gain range dsa: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 144 | |   |   |   |   Gain range amp: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 145 | |   |   |   |   Bandwidth range: 20000000.0 to 100000000.0 step 0.0 Hz | 
          
          
            |   | 146 | |   |   |   |   Connection Type: IQ | 
          
          
            |   | 147 | |   |   |   |   Uses LO offset: No | 
          
          
            |   | 148 | |   |   |     _____________________________________________________ | 
          
          
            |   | 149 | |   |   |    / | 
          
          
            |   | 150 | |   |   |   |       RX Codec: A | 
          
          
            |   | 151 | |   |   |   |   Name: AD9371 Dual ADC | 
          
          
            |   | 152 | |   |   |   |   Gain Elements: None | 
          
          
            |   | 153 | |   |     _____________________________________________________ | 
          
          
            |   | 154 | |   |    / | 
          
          
            |   | 155 | |   |   |       RX Dboard: B | 
          
          
            |   | 156 | |   |   |     _____________________________________________________ | 
          
          
            |   | 157 | |   |   |    / | 
          
          
            |   | 158 | |   |   |   |       RX Frontend: 0 | 
          
          
            |   | 159 | |   |   |   |   Name: Magnesium | 
          
          
            |   | 160 | |   |   |   |   Antennas: TX/RX, RX2, CAL, LOCAL | 
          
          
            |   | 161 | |   |   |   |   Sensors: lo_locked, ad9371_lo_locked, lowband_lo_locked | 
          
          
            |   | 162 | |   |   |   |   Freq range: 1.000 to 6000.000 MHz | 
          
          
            |   | 163 | |   |   |   |   Gain range all: 0.0 to 75.0 step 0.5 dB | 
          
          
            |   | 164 | |   |   |   |   Gain range rfic: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 165 | |   |   |   |   Gain range dsa: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 166 | |   |   |   |   Gain range amp: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 167 | |   |   |   |   Bandwidth range: 20000000.0 to 100000000.0 step 0.0 Hz | 
          
          
            |   | 168 | |   |   |   |   Connection Type: IQ | 
          
          
            |   | 169 | |   |   |   |   Uses LO offset: No | 
          
          
            |   | 170 | |   |   |     _____________________________________________________ | 
          
          
            |   | 171 | |   |   |    / | 
          
          
            |   | 172 | |   |   |   |       RX Frontend: 1 | 
          
          
            |   | 173 | |   |   |   |   Name: Magnesium | 
          
          
            |   | 174 | |   |   |   |   Antennas: TX/RX, RX2, CAL, LOCAL | 
          
          
            |   | 175 | |   |   |   |   Sensors: lo_locked, ad9371_lo_locked, lowband_lo_locked | 
          
          
            |   | 176 | |   |   |   |   Freq range: 1.000 to 6000.000 MHz | 
          
          
            |   | 177 | |   |   |   |   Gain range all: 0.0 to 75.0 step 0.5 dB | 
          
          
            |   | 178 | |   |   |   |   Gain range rfic: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 179 | |   |   |   |   Gain range dsa: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 180 | |   |   |   |   Gain range amp: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 181 | |   |   |   |   Bandwidth range: 20000000.0 to 100000000.0 step 0.0 Hz | 
          
          
            |   | 182 | |   |   |   |   Connection Type: IQ | 
          
          
            |   | 183 | |   |   |   |   Uses LO offset: No | 
          
          
            |   | 184 | |   |   |     _____________________________________________________ | 
          
          
            |   | 185 | |   |   |    / | 
          
          
            |   | 186 | |   |   |   |       RX Codec: B | 
          
          
            |   | 187 | |   |   |   |   Name: AD9371 Dual ADC | 
          
          
            |   | 188 | |   |   |   |   Gain Elements: None | 
          
          
            |   | 189 | |   |     _____________________________________________________ | 
          
          
            |   | 190 | |   |    / | 
          
          
            |   | 191 | |   |   |       TX Dboard: A | 
          
          
            |   | 192 | |   |   |     _____________________________________________________ | 
          
          
            |   | 193 | |   |   |    / | 
          
          
            |   | 194 | |   |   |   |       TX Frontend: 0 | 
          
          
            |   | 195 | |   |   |   |   Name: Magnesium | 
          
          
            |   | 196 | |   |   |   |   Antennas: TX/RX | 
          
          
            |   | 197 | |   |   |   |   Sensors: lo_locked, ad9371_lo_locked, lowband_lo_locked | 
          
          
            |   | 198 | |   |   |   |   Freq range: 1.000 to 6000.000 MHz | 
          
          
            |   | 199 | |   |   |   |   Gain range all: 0.0 to 65.0 step 0.5 dB | 
          
          
            |   | 200 | |   |   |   |   Gain range rfic: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 201 | |   |   |   |   Gain range dsa: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 202 | |   |   |   |   Gain range amp: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 203 | |   |   |   |   Bandwidth range: 20000000.0 to 100000000.0 step 0.0 Hz | 
          
          
            |   | 204 | |   |   |   |   Connection Type: IQ | 
          
          
            |   | 205 | |   |   |   |   Uses LO offset: No | 
          
          
            |   | 206 | |   |   |     _____________________________________________________ | 
          
          
            |   | 207 | |   |   |    / | 
          
          
            |   | 208 | |   |   |   |       TX Frontend: 1 | 
          
          
            |   | 209 | |   |   |   |   Name: Magnesium | 
          
          
            |   | 210 | |   |   |   |   Antennas: TX/RX | 
          
          
            |   | 211 | |   |   |   |   Sensors: lo_locked, ad9371_lo_locked, lowband_lo_locked | 
          
          
            |   | 212 | |   |   |   |   Freq range: 1.000 to 6000.000 MHz | 
          
          
            |   | 213 | |   |   |   |   Gain range all: 0.0 to 65.0 step 0.5 dB | 
          
          
            |   | 214 | |   |   |   |   Gain range rfic: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 215 | |   |   |   |   Gain range dsa: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 216 | |   |   |   |   Gain range amp: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 217 | |   |   |   |   Bandwidth range: 20000000.0 to 100000000.0 step 0.0 Hz | 
          
          
            |   | 218 | |   |   |   |   Connection Type: IQ | 
          
          
            |   | 219 | |   |   |   |   Uses LO offset: No | 
          
          
            |   | 220 | |   |   |     _____________________________________________________ | 
          
          
            |   | 221 | |   |   |    / | 
          
          
            |   | 222 | |   |   |   |       TX Codec: A | 
          
          
            |   | 223 | |   |   |   |   Name: AD9371 Dual DAC | 
          
          
            |   | 224 | |   |   |   |   Gain Elements: None | 
          
          
            |   | 225 | |   |     _____________________________________________________ | 
          
          
            |   | 226 | |   |    / | 
          
          
            |   | 227 | |   |   |       TX Dboard: B | 
          
          
            |   | 228 | |   |   |     _____________________________________________________ | 
          
          
            |   | 229 | |   |   |    / | 
          
          
            |   | 230 | |   |   |   |       TX Frontend: 0 | 
          
          
            |   | 231 | |   |   |   |   Name: Magnesium | 
          
          
            |   | 232 | |   |   |   |   Antennas: TX/RX | 
          
          
            |   | 233 | |   |   |   |   Sensors: lo_locked, ad9371_lo_locked, lowband_lo_locked | 
          
          
            |   | 234 | |   |   |   |   Freq range: 1.000 to 6000.000 MHz | 
          
          
            |   | 235 | |   |   |   |   Gain range all: 0.0 to 65.0 step 0.5 dB | 
          
          
            |   | 236 | |   |   |   |   Gain range rfic: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 237 | |   |   |   |   Gain range dsa: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 238 | |   |   |   |   Gain range amp: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 239 | |   |   |   |   Bandwidth range: 20000000.0 to 100000000.0 step 0.0 Hz | 
          
          
            |   | 240 | |   |   |   |   Connection Type: IQ | 
          
          
            |   | 241 | |   |   |   |   Uses LO offset: No | 
          
          
            |   | 242 | |   |   |     _____________________________________________________ | 
          
          
            |   | 243 | |   |   |    / | 
          
          
            |   | 244 | |   |   |   |       TX Frontend: 1 | 
          
          
            |   | 245 | |   |   |   |   Name: Magnesium | 
          
          
            |   | 246 | |   |   |   |   Antennas: TX/RX | 
          
          
            |   | 247 | |   |   |   |   Sensors: lo_locked, ad9371_lo_locked, lowband_lo_locked | 
          
          
            |   | 248 | |   |   |   |   Freq range: 1.000 to 6000.000 MHz | 
          
          
            |   | 249 | |   |   |   |   Gain range all: 0.0 to 65.0 step 0.5 dB | 
          
          
            |   | 250 | |   |   |   |   Gain range rfic: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 251 | |   |   |   |   Gain range dsa: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 252 | |   |   |   |   Gain range amp: 0.0 to 0.0 step 0.0 dB | 
          
          
            |   | 253 | |   |   |   |   Bandwidth range: 20000000.0 to 100000000.0 step 0.0 Hz | 
          
          
            |   | 254 | |   |   |   |   Connection Type: IQ | 
          
          
            |   | 255 | |   |   |   |   Uses LO offset: No | 
          
          
            |   | 256 | |   |   |     _____________________________________________________ | 
          
          
            |   | 257 | |   |   |    / | 
          
          
            |   | 258 | |   |   |   |       TX Codec: B | 
          
          
            |   | 259 | |   |   |   |   Name: AD9371 Dual DAC | 
          
          
            |   | 260 | |   |   |   |   Gain Elements: None | 
          
          
            |   | 261 | |   |     _____________________________________________________ | 
          
          
            |   | 262 | |   |    / | 
          
          
            |   | 263 | |   |   |       RFNoC blocks on this device: | 
          
          
            |   | 264 | |   |   | | 
          
          
            |   | 265 | |   |   |   * DmaFIFO_0 | 
          
          
            |   | 266 | |   |   |   * Radio_0 | 
          
          
            |   | 267 | |   |   |   * Radio_1 | 
          
          
            |   | 268 | |   |   |   * DDC_0 | 
          
          
            |   | 269 | |   |   |   * DDC_1 | 
          
          
            |   | 270 | |   |   |   * DUC_0 | 
          
          
            |   | 271 | |   |   |   * DUC_1 | 
          
          
            |   | 272 |  | 
          
          
            |   | 273 |  | 
          
          
            |   | 274 | }}} | 
          
          
            |   | 275 |  | 
          
          
            |   | 276 | === Run application === | 
          
          
            |   | 277 | From root/SPECTRUM_VIEW directory run the pre-compiled application that can read samples from the N310. | 
          
          
            |   | 278 | {{{ | 
          
          
            |   | 279 | native@localhost:~$ cd SPECTRUM_VIEW/ | 
          
          
            |   | 280 | native@localhost:~/SPECTRUM_VIEW$ ./app_read_n310_samples | 
          
          
            |   | 281 |  INFO  11:51:08.262 (main.cpp:623) - Starting command server at 5180 | 
          
          
            |   | 282 |  INFO  11:51:08.262 (main.cpp:175) - Starting websock server at 9002 | 
          
          
            |   | 283 | ........... | 
          
          
            |   | 284 | }}} | 
          
          
            |   | 285 | In short the application runs a server listening for commands. Just to briefly demonstrate the functionality, open the spectrum_view.html file in a Chrome browser, this will issues commands to configure the N310 and display a short spectrum width. | 
          
          
            |   | 286 | When the viewer is first opened, you should see the text CONNECTED below the plot. | 
          
          
            |   | 287 |  || [[Image(basic_usage_spectrum_view_1, width=125px)]] || | 
          
          
            |   | 288 |  | 
          
          
            |   | 289 | Keep the default values for RATE, FREQ, GAIN and click on the HALTED button. This should display the spectrum if all went well. | 
          
          
            |   | 290 |  || [[Image(basic_usage_spectrum_view_2, width=125px)]] || | 
          
          
            |   | 291 |  | 
          
          
            |   | 292 | === Troubleshooting === |