GPS support added (experimental)

README.md

@@ -159,10 +159,10 @@ Note: all settings are stored in NVRAM and will be reloaded when device starts.
 	1 = cumulative counter, mac counter is never reset
 	2 = cyclic confirmed, like 0 but data is resent until confirmation by network received
   
-0x03 (NOT YET IMPLEMENTED) set screen saver mode
+0x03 set GPS on/off
 
-	0 = screen saver off [default]
+	0 = GPS off [default]
-	1 = screen saver on
+	1 = GPS on, GPS data set (if present) added to payload
 
 0x04 set display on/off
 
@@ -232,7 +232,7 @@ Note: all settings are stored in NVRAM and will be reloaded when device starts.
 
 0x80 get device configuration
 
-device answers with it's current configuration. The configuration is a C structure declared in file [globals.h](src/globals.h#L27-L44) with the following definition:
+device answers with it's current configuration. The configuration is a C structure declared in file [globals.h](src/globals.h#L27-L45) with the following definition:
 
 	byte 1:			Lora SF (7..12)
 	byte 2:			Lora TXpower (2..15)
@@ -248,7 +248,8 @@ device answers with it's current configuration. The configuration is a C structu
 	byte 13:		Wifi antenna switch (0=internal, 1=external)
 	byte 14:		Vendorfilter mode (0=disabled, 1=enabled)
 	byte 15:		RGB LED luminosity (0..100 %)
-	bytes 16-26:		Software version (ASCII format, terminating with zero)
+	byte 16:		GPS status (1=on, 0=off)
+	bytes 17-27:		Software version (ASCII format, terminating with zero)
 
 0x81 get device uptime
 
@@ -262,6 +263,14 @@ device answers with it's current configuration. The configuration is a C structu
 
 	bytes 1-2:		battery voltage in millivolt, 0 if unreadable (little endian format)
 
+0x84 get device GPS status (NOT YET IMPLEMENTED)
+
+	bytes 1-4:		latitude
+	bytes 5-8:		longitude
+	byte 9:			number of satellites
+	byte 10:		HDOP
+	bytes 11-12:	altidute [meter]
+
 # License
 
 Copyright  2018 Oliver Brandmueller <ob@sysadm.in>

platformio.ini

@@ -27,11 +27,12 @@ description = Paxcounter is a proof-of-concept ESP32 device for metering passeng
 [common_env_data]
 platform_espressif32 = espressif32@>=1.0.2
 board_build.partitions = no_ota.csv
-board_upload.maximum_size = 2097152
 lib_deps_display =
     U8g2@>=2.22.14
 lib_deps_rgbled =
-    SmartLeds
+    SmartLeds@>=1.1.3
+lib_deps_gps =
+    TinyGPSPlus@>=1.0.0    
 build_flags = 
 ; we need build_flag for logging, otherwise we can't use ESP_LOGx in arduino framework
 ; ---> NOTE: For production run set DEBUG_LEVEL level to NONE! <---
@@ -51,7 +52,6 @@ platform = ${common_env_data.platform_espressif32}
 framework = arduino
 board = heltec_wifi_lora_32
 board_build.partitions = ${common_env_data.board_build.partitions}
-board_upload.maximum_size = ${common_env_data.board_upload.maximum_size}
 monitor_speed = 115200
 upload_speed = 115200 
 lib_deps = 
@@ -65,7 +65,6 @@ platform = ${common_env_data.platform_espressif32}
 framework = arduino
 board = esp32dev
 board_build.partitions = ${common_env_data.board_build.partitions}
-board_upload.maximum_size = ${common_env_data.board_upload.maximum_size}
 monitor_speed = 115200
 upload_speed = 115200 
 lib_deps = 
@@ -79,7 +78,6 @@ platform = ${common_env_data.platform_espressif32}
 framework = arduino
 board = esp32dev
 board_build.partitions = ${common_env_data.board_build.partitions}
-board_upload.maximum_size = ${common_env_data.board_upload.maximum_size}
 monitor_speed = 115200
 upload_speed = 921600
 lib_deps = 
@@ -93,7 +91,6 @@ platform = ${common_env_data.platform_espressif32}
 framework = arduino
 board = esp32dev
 board_build.partitions = ${common_env_data.board_build.partitions}
-board_upload.maximum_size = ${common_env_data.board_upload.maximum_size}
 monitor_speed = 115200
 upload_speed = 921600
 lib_deps = 
@@ -107,11 +104,11 @@ platform = ${common_env_data.platform_espressif32}
 framework = arduino
 board = esp32dev
 board_build.partitions = ${common_env_data.board_build.partitions}
-board_upload.maximum_size = ${common_env_data.board_upload.maximum_size}
 monitor_speed = 115200
 upload_speed = 921600
 lib_deps = 
     ${common_env_data.lib_deps_display}
+    ${common_env_data.lib_deps_gps}
 build_flags = 
     ${common_env_data.build_flags}
     -include "src/hal/ttgobeam.h"
@@ -121,7 +118,6 @@ platform = espressif32@1.0.1
 framework = arduino
 board = esp32dev
 board_build.partitions = ${common_env_data.board_build.partitions}
-board_upload.maximum_size = ${common_env_data.board_upload.maximum_size}
 monitor_speed = 115200
 upload_speed = 921600
 lib_deps = 
@@ -135,7 +131,6 @@ platform = ${common_env_data.platform_espressif32}
 framework = arduino
 board = esp32dev
 board_build.partitions = ${common_env_data.board_build.partitions}
-board_upload.maximum_size = ${common_env_data.board_upload.maximum_size}
 monitor_speed = 115200
 upload_speed = 921600
 lib_deps = 
@@ -149,7 +144,6 @@ platform = ${common_env_data.platform_espressif32}
 framework = arduino
 board = esp32dev
 board_build.partitions = ${common_env_data.board_build.partitions}
-board_upload.maximum_size = ${common_env_data.board_upload.maximum_size}
 monitor_speed = 115200
 upload_speed = 921600
 lib_deps =
@@ -163,7 +157,6 @@ platform = ${common_env_data.platform_espressif32}
 framework = arduino
 board = lolin32
 board_build.partitions = ${common_env_data.board_build.partitions}
-board_upload.maximum_size = ${common_env_data.board_upload.maximum_size}
 monitor_speed = 115200
 upload_speed = 256000
 lib_deps = 
@@ -177,7 +170,6 @@ platform = ${common_env_data.platform_espressif32}
 framework = arduino 
 board = lolin32
 board_build.partitions = ${common_env_data.board_build.partitions}
-board_upload.maximum_size = ${common_env_data.board_upload.maximum_size}
 monitor_speed = 115200
 upload_speed = 921600
 lib_deps = 

src/configmanager.cpp

@@ -22,7 +22,7 @@ void defaultConfig() {
     cfg.txpower       = 15;             // 2-15, lora tx power
     cfg.adrmode       = 1;              // 0=disabled, 1=enabled
     cfg.screensaver   = 0;              // 0=disabled, 1=enabled
-    cfg.screenon      = 1;              // 0=disbaled, 1=enabled
+    cfg.screenon      = 1;              // 0=disabled, 1=enabled
     cfg.countermode   = 0;              // 0=cyclic, 1=cumulative, 2=cyclic confirmed
     cfg.rssilimit     = 0;              // threshold for rssilimiter, negative value!
     cfg.sendcycle     = SEND_SECS;      // payload send cycle [seconds/2]
@@ -32,6 +32,7 @@ void defaultConfig() {
     cfg.wifiant       = 0;              // 0=internal, 1=external (for LoPy/LoPy4)
     cfg.vendorfilter  = 1;              // 0=disabled, 1=enabled
     cfg.rgblum        = RGBLUMINOSITY;  // RGB Led luminosity (0..100%)
+    cfg.gpsmode       = 1;              // 0=disabled, 1=enabled
 
     strncpy( cfg.version, PROGVERSION, sizeof(cfg.version)-1 );
 }
@@ -120,6 +121,9 @@ void saveConfig() {
       if( nvs_get_i8(my_handle, "rgblum", &flash8) != ESP_OK || flash8 != cfg.rgblum )
           nvs_set_i8(my_handle, "rgblum", cfg.rgblum);
 
+      if( nvs_get_i8(my_handle, "gpsmode", &flash8) != ESP_OK || flash8 != cfg.gpsmode )
+      nvs_set_i8(my_handle, "gpsmode", cfg.gpsmode);
+
       if( nvs_get_i16(my_handle, "rssilimit", &flash16) != ESP_OK || flash16 != cfg.rssilimit )
         nvs_set_i16(my_handle, "rssilimit", cfg.rssilimit);
 
@@ -284,6 +288,14 @@ void loadConfig() {
       saveConfig();
     }
 
+    if( nvs_get_i8(my_handle, "gpsmode", &flash8) == ESP_OK ) {
+      cfg.gpsmode = flash8;
+      ESP_LOGI(TAG, "GPSmode = %d", flash8);
+    } else {
+      ESP_LOGI(TAG, "GPSmode set to default %d", cfg.gpsmode);
+      saveConfig();
+    }
+
     nvs_close(my_handle);
     ESP_LOGI(TAG, "Done");
 

src/globals.h

@@ -11,6 +11,11 @@
     #include <U8x8lib.h>
 #endif
 
+//GPS
+#ifdef HAS_GPS
+    #include <TinyGPS++.h>
+#endif
+
 // LMIC-Arduino LoRaWAN Stack
 #include <lmic.h>
 #include <hal/hal.h>
@@ -32,7 +37,7 @@ typedef struct {
   uint8_t screensaver;                  // 0=disabled, 1=enabled
   uint8_t screenon;                     // 0=disabled, 1=enabled
   uint8_t countermode;                  // 0=cyclic unconfirmed, 1=cumulative, 2=cyclic confirmed
-  int16_t rssilimit;                   // threshold for rssilimiter, negative value!
+  int16_t rssilimit;                    // threshold for rssilimiter, negative value!
   uint8_t sendcycle;                    // payload send cycle [seconds/2]
   uint8_t wifichancycle;                // wifi channel switch cycle [seconds/100]
   uint8_t blescantime;                  // BLE scan cycle duration [seconds]
@@ -40,14 +45,29 @@ typedef struct {
   uint8_t wifiant;                      // 0=internal, 1=external (for LoPy/LoPy4)
   uint8_t vendorfilter;                 // 0=disabled, 1=enabled
   uint8_t rgblum;                       // RGB Led luminosity (0..100%)
-  char version[10];                    // Firmware version
+  uint8_t gpsmode;                      // 0=disabled, 1=enabled
+  char version[10];                     // Firmware version
   } configData_t;
 
+#ifdef HAS_GPS
+  typedef struct {
+    uint32_t latitude;
+    uint32_t longitude;
+    uint8_t hdop;
+    uint8_t satellites;
+    uint16_t altitude;
+    } gpsStatus_t;
+  extern gpsStatus_t gps_status;        // struct for storing gps data
+  extern TinyGPSPlus my_gps;            // Make TinyGPS++ instance globally availabe
+#endif
+
 extern configData_t cfg;
 extern uint64_t uptimecounter;
-extern osjob_t sendjob;
+extern osjob_t sendjob, rcmdjob;
 extern char display_lora[], display_lmic[];
 extern int countermode, screensaver, adrmode, lorasf, txpower, rlim;
 extern uint16_t macs_total, macs_wifi, macs_ble; // MAC counters
 extern std::set<uint16_t> macs;
-extern hw_timer_t * channelSwitch;      // hardware timer used for wifi channel switching
+extern hw_timer_t * channelSwitch; // hardware timer used for wifi channel switching
+extern xref2u1_t rcmd_data;        // buffer for rcommand results size
+extern u1_t rcmd_data_size;        // buffer for rcommand results size

src/gpsread.cpp

@@ -0,0 +1,27 @@
+#ifdef HAS_GPS
+
+#include "globals.h"
+
+// Local logging tag
+static const char TAG[] = "main";
+
+// GPS Read FreeRTos Task
+void gps_loop(void * pvParameters) {
+
+    configASSERT( ( ( uint32_t ) pvParameters ) == 1 ); // FreeRTOS check
+
+    HardwareSerial GPS_Serial(1);                 
+    //GPS_Serial.begin(9600, SERIAL_8N1, 12, 15);
+    GPS_Serial.begin(HAS_GPS);
+
+    while(1) {
+
+        while (GPS_Serial.available()) {
+            my_gps.encode(GPS_Serial.read());
+        }
+
+        vTaskDelay(1/portTICK_PERIOD_MS); // reset watchdog
+    }    
+}
+
+#endif // HAS_GPS

src/hal/ttgobeam.h

@@ -3,11 +3,10 @@
 #define CFG_sx1276_radio 1 // HPD13A LoRa SoC
 
 #define HAS_LED 21 // on board green LED_G1
-#define HAS_BUTTON GPIO_NUM_39 // button on board next to battery indicator LED (other one is reset)
+#define HAS_BUTTON GPIO_NUM_0 // on board button "BOOT" (next to reset button)
 #define HAS_BATTERY_PROBE ADC1_GPIO35_CHANNEL // battery probe GPIO pin -> ADC1_CHANNEL_7
 #define BATT_FACTOR 2 // voltage divider 100k/100k on board
-// #define HAS_GPS // to be done
+#define HAS_GPS 9600, SERIAL_8N1, 12, 15   //17-TX 18-RX
-// GSP serial (9600, SERIAL_8N1, 12, 15);   //17-TX 18-RX
 
 // re-define pin definitions of pins_arduino.h
 #define PIN_SPI_SS    18 // ESP32 GPIO18 (Pin18) -- HPD13A NSS/SEL (Pin4) SPI Chip Select Input

src/lorawan.cpp

@@ -109,7 +109,7 @@ void do_send(osjob_t* j){
 
     // Check if there is a pending TX/RX job running
     if (LMIC.opmode & OP_TXRXPEND) {
-        ESP_LOGI(TAG, "OP_TXRXPEND, not sending");
+        ESP_LOGI(TAG, "LoRa busy, rescheduling");
         sprintf(display_lmic, "LORA BUSY");
         goto end;
     }
@@ -129,11 +129,25 @@ void do_send(osjob_t* j){
         mydata[3] = 0;
     }
 
+    
+
     // Prepare upstream data transmission at the next possible time.
-    LMIC_setTxData2(1, mydata, sizeof(mydata), (cfg.countermode & 0x02));
+    LMIC_setTxData2(COUNTERPORT, mydata, sizeof(mydata), (cfg.countermode & 0x02));
-    ESP_LOGI(TAG, "Packet queued");
+    ESP_LOGI(TAG, "%d bytes queued to send", sizeof(mydata));
     sprintf(display_lmic, "PACKET QUEUED");
     
+    #ifdef HAS_GPS
+        if (cfg.gpsmode && my_gps.location.isValid()) {
+            gps_status.latitude = my_gps.location.lat();
+            gps_status.longitude = my_gps.location.lng();
+            gps_status.satellites = my_gps.satellites.value();
+            gps_status.hdop = my_gps.hdop.value();
+            gps_status.altitude = my_gps.altitude.meters();
+            LMIC_setTxData2(GPSPORT, (byte*)&gps_status, sizeof(gps_status), (cfg.countermode & 0x02));
+            ESP_LOGI(TAG, "HDOP=%d, SATS=%d, LAT=%d, LON=%d", gps_status.hdop, gps_status.satellites, gps_status.latitude, gps_status.longitude );
+        }
+    #endif
+    
     // clear counter if not in cumulative counter mode
     if (cfg.countermode != 1) {
         reset_counters();                       // clear macs container and reset all counters
@@ -200,8 +214,9 @@ void onEvent (ev_t ev) {
                     unsigned char* buffer = new unsigned char[MAX_LEN_FRAME];
                     memcpy(buffer, LMIC.frame, MAX_LEN_FRAME); //Copy data from cfg to char*
                     int i, k = LMIC.dataBeg, l = LMIC.dataBeg+LMIC.dataLen-2;
-                    for (i=k; i<=l; i+=2)
+                    for (i=k; i<=l; i+=2) {
                         rcommand(buffer[i], buffer[i+1]);
+                    }
                     delete[] buffer; //free memory
                 }
             }

src/main.cpp

@@ -39,7 +39,7 @@ Refer to LICENSE.txt file in repository for more details.
 
 // Initialize global variables
 configData_t cfg;                   // struct holds current device configuration
-osjob_t sendjob;                    // LMIC job handler
+osjob_t sendjob, rcmdjob;           // LMIC job handler
 uint64_t uptimecounter = 0;         // timer global for uptime counter
 uint8_t DisplayState = 0;           // globals for state machine
 uint16_t macs_total = 0, macs_wifi = 0, macs_ble = 0;   // MAC counters globals for display
@@ -52,6 +52,13 @@ uint16_t LEDBlinkDuration = 0;      // How long the blink need to be
 uint16_t LEDColor = COLOR_NONE;     // state machine variable to set RGB LED color
 hw_timer_t * displaytimer = NULL;   // configure hardware timer used for cyclic display refresh
 hw_timer_t * channelSwitch = NULL;  // configure hardware timer used for wifi channel switching
+xref2u1_t rcmd_data;                // buffer for rcommand results size
+u1_t rcmd_data_size;                // buffer for rcommand results size
+
+#ifdef HAS_GPS
+    gpsStatus_t gps_status;         // struct for storing gps data
+    TinyGPSPlus my_gps;             // create TinyGPS++ instance
+#endif
 
 portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED; // sync main loop and ISR when modifying shared variable DisplayIRQ
 
@@ -130,37 +137,14 @@ void lorawan_loop(void * pvParameters) {
 
     configASSERT( ( ( uint32_t ) pvParameters ) == 1 ); // FreeRTOS check
 
-    //static uint16_t lorawait = 0;
-
     while(1) {
-        
+        os_runloop_once();                  // execute LMIC jobs
-        // execute LMIC jobs
+        vTaskDelay(1/portTICK_PERIOD_MS);   // reset watchdog
-        os_runloop_once();
-
-        /*
-        // check if payload is sent
-        while(LMIC.opmode & OP_TXRXPEND) {
-            if(!lorawait) 
-                sprintf(display_lora, "LoRa wait");
-            lorawait++;
-            // in case sending really fails: reset LMIC and rejoin network
-            if( (lorawait % MAXLORARETRY ) == 0) {
-                ESP_LOGI(TAG, "Payload not sent, resetting LMIC and rejoin");
-                lorawait = 0;                
-                LMIC_reset(); // Reset the MAC state. Session and pending data transfers will be discarded.
-            };
-            vTaskDelay(1000/portTICK_PERIOD_MS);
-        }
-        */
-
-        vTaskDelay(1/portTICK_PERIOD_MS); // reset watchdog
     }    
 }
 
-
 /* end LMIC specific parts --------------------------------------------------------------- */
 
-
 /* beginn hardware specific parts -------------------------------------------------------- */
 
 #ifdef HAS_DISPLAY
@@ -498,7 +482,6 @@ void setup() {
     delay(1000);
 #endif
 
-
     // initialize button handling if needed
 #ifdef HAS_BUTTON
     strcat(features, " BTN_");
@@ -521,6 +504,11 @@ void setup() {
     antenna_init();
 #endif
 
+// initialize gps if present
+#ifdef HAS_GPS
+    strcat(features, " GPS");
+#endif
+
 #ifdef HAS_DISPLAY
     strcat(features, " OLED");
     // initialize display  
@@ -589,6 +577,14 @@ xTaskCreatePinnedToCore(sniffer_loop, "wifisniffer", 2048, ( void * ) 1, 1, NULL
     }
 #endif
 
+// if device has GPS and GPS function is enabled, start GPS reader task on core 0
+#ifdef HAS_GPS
+    if (cfg.gpsmode) {
+    ESP_LOGI(TAG, "Starting GPS task on core 0");
+    xTaskCreatePinnedToCore(gps_loop, "gpsreader", 2048, ( void * ) 1, 1, NULL, 0);
+    }
+#endif
+
 // kickoff sendjob -> joins network and rescedules sendjob for cyclic transmitting payload
 do_send(&sendjob);
 

src/main.h

@@ -1,6 +1,6 @@
 
 // program version - note: increment version after modifications to configData_t struct!!
-#define PROGVERSION                     "1.3.71"    // use max 10 chars here!
+#define PROGVERSION                     "1.3.8"    // use max 10 chars here!
 #define PROGNAME                        "PAXCNT"
 
 //--- Declarations ---
@@ -42,6 +42,11 @@ void wifi_sniffer_packet_handler(void *buff, wifi_promiscuous_pkt_type_t type);
 
 // defined in blescan.cpp
 #ifdef BLECOUNTER
-    void start_BLEscan(void);
+  void start_BLEscan(void);
-    void stop_BLEscan(void);
+  void stop_BLEscan(void);
+#endif
+
+//defined in gpsread.cpp
+#ifdef HAS_GPS
+  void gps_loop(void * pvParameters);
 #endif

src/paxcounter.conf

@@ -37,11 +37,14 @@
 // LoRa payload send cycle --> take care of duty cycle of LoRaWAN network! <--
 #define SEND_SECS                       120     // [seconds/2] -> 240 sec.
 #define MEM_LOW                         2048    // [Bytes] low memory threshold triggering a send cycle
+#define RETRANSMIT_RCMD                 5       // [seconds] wait time before retransmitting rcommand results
 
 // Default LoRa Spreadfactor
 #define LORASFDEFAULT                   9       // 7 ... 12 SF, according to LoRaWAN specs
 #define MAXLORARETRY                    500     // maximum count of TX retries if LoRa busy
 #define RCMDPORT                        2       // LoRaWAN Port on which device listenes for remote commands
+#define GPSPORT                         3       // LoRaWAN Port on which device sends gps data
+#define COUNTERPORT                     1       // LoRaWAN Port on which device sends counts
 
 // Default RGB LED luminosity (in %)
 #define RGBLUMINOSITY                   30      // 30%

src/rcommand.cpp

@@ -29,6 +29,25 @@ typedef struct {
     uint32_t read_voltage(void);
 #endif
 
+// function sends result of get commands to LoRaWAN network
+void do_transmit(osjob_t* j){
+    // check if there is a pending TX/RX job running, if yes then reschedule transmission
+    if (LMIC.opmode & OP_TXRXPEND) {
+        ESP_LOGI(TAG, "LoRa busy, rescheduling");
+        sprintf(display_lmic, "LORA BUSY");
+        os_setTimedCallback(&rcmdjob, os_getTime()+sec2osticks(RETRANSMIT_RCMD), do_transmit);
+    }
+    LMIC_setTxData2(RCMDPORT, rcmd_data, rcmd_data_size, 0); // send data unconfirmed on RCMD Port
+    ESP_LOGI(TAG, "%d bytes queued to send", rcmd_data_size);
+    sprintf(display_lmic, "PACKET QUEUED");
+}
+
+// help function to transmit result of get commands, since callback function do_transmit() cannot have params
+void transmit(xref2u1_t mydata, u1_t mydata_size){
+    rcmd_data = mydata;
+    rcmd_data_size = mydata_size;
+    do_transmit(&rcmdjob);
+}
 
 // help function to assign LoRa datarates to numeric spreadfactor values
 void switch_lora (uint8_t sf, uint8_t tx) {
@@ -141,6 +160,14 @@ void set_display(uint8_t val) {
         }
 };
 
+void set_gps(uint8_t val) {
+    ESP_LOGI(TAG, "Remote command: set GPS to %s", val ? "on" : "off");
+    switch (val) {
+        case 1: cfg.gpsmode = val; break;
+        default: cfg.gpsmode = 0; break;
+        }
+};
+
 void set_lorasf(uint8_t val) {
     ESP_LOGI(TAG, "Remote command: set LoRa SF to %d", val);
     switch_lora(val, cfg.txpower);
@@ -204,30 +231,20 @@ void set_lorapower(uint8_t val) {
     switch_lora(cfg.lorasf, val);
 };
 
-void set_noop (uint8_t val) { 
-    ESP_LOGI(TAG, "Remote command: noop - doing nothing");
-};
-
 void get_config (uint8_t val) {
     ESP_LOGI(TAG, "Remote command: get configuration");
-    int size = sizeof(configData_t);
+    transmit((byte*)&cfg, sizeof(cfg));
-    LMIC_setTxData2(RCMDPORT, (byte*)&cfg, size, 0); // send data unconfirmed on RCMD Port
-    ESP_LOGI(TAG, "%d bytes queued in send queue", size);
 };
 
 void get_uptime (uint8_t val) {
     ESP_LOGI(TAG, "Remote command: get uptime");
-    int size = sizeof(uptimecounter);
+    transmit((byte*)&uptimecounter, sizeof(uptimecounter));
-    LMIC_setTxData2(RCMDPORT, (byte*)&uptimecounter, size, 0); // send data unconfirmed on RCMD Port
-    ESP_LOGI(TAG, "%d bytes queued in send queue", size);
 };
 
 void get_cputemp (uint8_t val) {
     ESP_LOGI(TAG, "Remote command: get cpu temperature");
     float temp = temperatureRead();
-    int size = sizeof(temp);
+    transmit((byte*)&temp, sizeof(temp));
-    LMIC_setTxData2(RCMDPORT, (byte*)&temp, size, 0); // send data unconfirmed on RCMD Port
-    ESP_LOGI(TAG, "%d bytes queued in send queue", size);
 };
 
 void get_voltage (uint8_t val) {
@@ -237,9 +254,20 @@ void get_voltage (uint8_t val) {
     #else
         uint16_t voltage = 0;
     #endif
-    int size = sizeof(voltage);
+    transmit((byte*)&voltage, sizeof(voltage));
-    LMIC_setTxData2(RCMDPORT, (byte*)&voltage, size, 0); // send data unconfirmed on RCMD Port
+};
-    ESP_LOGI(TAG, "%d bytes queued in send queue", size);
+
+void get_gps (uint8_t val) {
+    ESP_LOGI(TAG, "Remote command: get gps status");
+    #ifdef HAS_GPS
+        gps_status.latitude = my_gps.location.lat();
+        gps_status.longitude = my_gps.location.lng();
+        gps_status.satellites = my_gps.satellites.value();
+        gps_status.hdop = my_gps.hdop.value();
+        gps_status.altitude = my_gps.altitude.meters(); 
+        transmit((byte*)&gps_status, sizeof(gps_status));
+        ESP_LOGI(TAG, "HDOP=%d, SATS=%d, LAT=%d, LON=%d", gps_status.hdop, gps_status.satellites, gps_status.latitude, gps_status.longitude );
+    #endif
 };
 
 
@@ -249,7 +277,7 @@ void get_voltage (uint8_t val) {
 cmd_t table[] = {
                 {0x01, set_rssi, true},
                 {0x02, set_countmode, true},
-                {0x03, set_noop, false},
+                {0x03, set_gps, true},
                 {0x04, set_display, true},
                 {0x05, set_lorasf, true},
                 {0x06, set_lorapower, true},
@@ -266,7 +294,8 @@ cmd_t table[] = {
                 {0x80, get_config, false},
                 {0x81, get_uptime, false},
                 {0x82, get_cputemp, false},
-                {0x83, get_voltage, false}
+                {0x83, get_voltage, false},
+                {0x84, get_gps, false}
                 };
 
 // check and execute remote command