peer_to_peer_example.cpp

00001 #include "dot_util.h"
00002 #include "RadioEvent.h"
00003  
00004 #if ACTIVE_EXAMPLE == PEER_TO_PEER_EXAMPLE
00005 
00006 /////////////////////////////////////////////////////////////////////////////
00007 // -------------------- DOT LIBRARY REQUIRED ------------------------------//
00008 // * Because these example programs can be used for both mDot and xDot     //
00009 //     devices, the LoRa stack is not included. The libmDot library should //
00010 //     be imported if building for mDot devices. The libxDot library       //
00011 //     should be imported if building for xDot devices.                    //
00012 // * https://developer.mbed.org/teams/MultiTech/code/libmDot-dev-mbed5/    //
00013 // * https://developer.mbed.org/teams/MultiTech/code/libmDot-mbed5/        //
00014 // * https://developer.mbed.org/teams/MultiTech/code/libxDot-dev-mbed5/    //
00015 // * https://developer.mbed.org/teams/MultiTech/code/libxDot-mbed5/        //
00016 /////////////////////////////////////////////////////////////////////////////
00017 
00018 /////////////////////////////////////////////////////////////
00019 // * these options must match between the two devices in   //
00020 //   order for communication to be successful
00021 /////////////////////////////////////////////////////////////
00022 static uint8_t network_address[] = { 0x01, 0x02, 0x03, 0x04 };
00023 static uint8_t network_session_key[] = { 0x01, 0x02, 0x03, 0x04, 0x01, 0x02, 0x03, 0x04, 0x01, 0x02, 0x03, 0x04, 0x01, 0x02, 0x03, 0x04 };
00024 static uint8_t data_session_key[] = { 0x01, 0x02, 0x03, 0x04, 0x01, 0x02, 0x03, 0x04, 0x01, 0x02, 0x03, 0x04, 0x01, 0x02, 0x03, 0x04 };
00025 
00026 mDot* dot = NULL;
00027 lora::ChannelPlan* plan = NULL;
00028 
00029 mbed::UnbufferedSerial pc(USBTX, USBRX);
00030 
00031 #if defined(TARGET_XDOT_L151CC)
00032 I2C i2c(I2C_SDA, I2C_SCL);
00033 ISL29011 lux(i2c);
00034 #else
00035 AnalogIn lux(XBEE_AD0);
00036 #endif
00037 
00038 int main() {
00039     // Custom event handler for automatically displaying RX data
00040     RadioEvent events;
00041     uint32_t tx_frequency;
00042     uint8_t tx_datarate;
00043     uint8_t tx_power;
00044     uint8_t frequency_band;
00045 
00046     pc.baud(115200);
00047 
00048 #if defined(TARGET_XDOT_L151CC)
00049     i2c.frequency(400000);
00050 #endif
00051 
00052     mts::MTSLog::setLogLevel(mts::MTSLog::TRACE_LEVEL);
00053 
00054     // Create channel plan
00055     plan = create_channel_plan();
00056     assert(plan);
00057 
00058     dot = mDot::getInstance(plan);
00059     assert(dot);
00060 
00061     logInfo("mbed-os library version: %d.%d.%d", MBED_MAJOR_VERSION, MBED_MINOR_VERSION, MBED_PATCH_VERSION);
00062 
00063     // start from a well-known state
00064     logInfo("defaulting Dot configuration");
00065     dot->resetConfig();
00066 
00067     // make sure library logging is turned on
00068     dot->setLogLevel(mts::MTSLog::INFO_LEVEL);
00069 
00070     // attach the custom events handler
00071     dot->setEvents(&events);
00072 
00073     // update configuration if necessary
00074     if (dot->getJoinMode() != mDot::PEER_TO_PEER) {
00075         logInfo("changing network join mode to PEER_TO_PEER");
00076         if (dot->setJoinMode(mDot::PEER_TO_PEER) != mDot::MDOT_OK) {
00077             logError("failed to set network join mode to PEER_TO_PEER");
00078         }
00079     }
00080     frequency_band = dot->getFrequencyBand();
00081     switch (frequency_band) {
00082         case lora::ChannelPlan::EU868_OLD:
00083         case lora::ChannelPlan::EU868:
00084             // 250kHz channels achieve higher throughput
00085             // DR_6 : SF7 @ 250kHz
00086             // DR_0 - DR_5 (125kHz channels) available but much slower
00087             tx_frequency = 869850000;
00088             tx_datarate = lora::DR_6;
00089             // the 869850000 frequency is 100% duty cycle if the total power is under 7 dBm - tx power 4 + antenna gain 3 = 7
00090             tx_power = 4;
00091             break;
00092 
00093         case lora::ChannelPlan::US915_OLD:
00094         case lora::ChannelPlan::US915:
00095         case lora::ChannelPlan::AU915_OLD:
00096         case lora::ChannelPlan::AU915:
00097             // 500kHz channels achieve highest throughput
00098             // DR_8 : SF12 @ 500kHz
00099             // DR_9 : SF11 @ 500kHz
00100             // DR_10 : SF10 @ 500kHz
00101             // DR_11 : SF9 @ 500kHz
00102             // DR_12 : SF8 @ 500kHz
00103             // DR_13 : SF7 @ 500kHz
00104             // DR_0 - DR_3 (125kHz channels) available but much slower
00105             tx_frequency = 915500000;
00106             tx_datarate = lora::DR_13;
00107             // 915 bands have no duty cycle restrictions, set tx power to max
00108             tx_power = 20;
00109             break;
00110 
00111         case lora::ChannelPlan::AS923:
00112         case lora::ChannelPlan::AS923_JAPAN:
00113             // 250kHz channels achieve higher throughput
00114             // DR_6 : SF7 @ 250kHz
00115             // DR_0 - DR_5 (125kHz channels) available but much slower
00116             tx_frequency = 924800000;
00117             tx_datarate = lora::DR_6;
00118             tx_power = 16;
00119             break;
00120 
00121         case lora::ChannelPlan::KR920:
00122             // DR_5 : SF7 @ 125kHz
00123             tx_frequency = 922700000;
00124             tx_datarate = lora::DR_5;
00125             tx_power = 14;
00126             break;
00127 
00128         default:
00129             while (true) {
00130                 logFatal("no known channel plan in use - extra configuration is needed!");
00131                 ThisThread::sleep_for(5s);
00132             }
00133             break;
00134     }
00135     // in PEER_TO_PEER mode there is no join request/response transaction
00136     // as long as both Dots are configured correctly, they should be able to communicate
00137     update_peer_to_peer_config(network_address, network_session_key, data_session_key, tx_frequency, tx_datarate, tx_power);
00138 
00139     // save changes to configuration
00140     logInfo("saving configuration");
00141     if (!dot->saveConfig()) {
00142         logError("failed to save configuration");
00143     }
00144 
00145     // display configuration
00146     display_config();
00147 
00148     while (true) {
00149         uint16_t light;
00150         std::vector<uint8_t> tx_data;
00151 
00152         // join network if not joined
00153         if (!dot->getNetworkJoinStatus()) {
00154             join_network();
00155         }
00156 
00157 #if defined(TARGET_XDOT_L151CC)
00158         // configure the ISL29011 sensor on the xDot-DK for continuous ambient light sampling, 16 bit conversion, and maximum range
00159         lux.setMode(ISL29011::ALS_CONT);
00160         lux.setResolution(ISL29011::ADC_16BIT);
00161         lux.setRange(ISL29011::RNG_64000);
00162 
00163         // get the latest light sample and send it to the gateway
00164         light = lux.getData();
00165         tx_data.push_back((light >> 8) & 0xFF);
00166         tx_data.push_back(light & 0xFF);
00167         logInfo("light: %lu [0x%04X]", light, light);
00168         send_data(tx_data);
00169 
00170         // put the LSL29011 ambient light sensor into a low power state
00171         lux.setMode(ISL29011::PWR_DOWN);
00172 #else 
00173         // get some dummy data and send it to the gateway
00174         light = lux.read_u16();
00175         tx_data.push_back((light >> 8) & 0xFF);
00176         tx_data.push_back(light & 0xFF);
00177         logInfo("light: %lu [0x%04X]", light, light);
00178         send_data(tx_data);
00179 #endif
00180 
00181         // the Dot can't sleep in PEER_TO_PEER mode
00182         // it must be waiting for data from the other Dot
00183         // send data every 5 seconds
00184         logInfo("waiting for 5s");
00185         ThisThread::sleep_for(5s);
00186     }
00187  
00188     return 0;
00189 }
00190 
00191 #endif