MultiTech / libmDot-mbed5

Stable version of the mDot library for mbed 5. This version of the library is suitable for deployment scenarios. See lastest commit message for version of mbed-os library that has been tested against.

Dependents:   mdot_two_way unh-hackathon-example unh-hackathon-example-raw TelitSensorToCloud ... more

Fork of libmDot-dev-mbed5-deprecated by MultiTech

The Dot library provides a LoRaWan certified stack for LoRa communication using MultiTech mDot and xDot devices. The stack is compatible with mbed 5.

The name of the repository can be used to determine which device the stack was compiled for and if it's a development or production-ready build:

A changelog for the Dot library can be found here.

The Dot library version and the version of mbed-os it was compiled against can both be found in the commit message for that revision of the Dot library. Building your application with the same version of mbed-os as what was used to build the Dot library is highly recommended!

The Dot-Examples repository demonstrates how to use the Dot library in a custom application.

The mDot and xDot platform pages have lots of platform specific information and document potential issues, gotchas, etc, and provide instructions for getting started with development. Please take a look at the platform page before starting development as they should answer many questions you will have.

FOTA

Full FOTA support is only available with mDot, xDot does not have the required external flash. xDot can use the FOTA example to dynamically join a multicast session only. After joining the multicast session the received Fragmentation packets could be handed to a host MCU for processing and at completion the firmware can be loaded into the xDot using the bootloader and y-modem. See xDot Developer Guide.

  • Add the following code to allow Fota to use the Dot instance

main.cpp

    // Initialize FOTA singleton
    Fota::getInstance(dot);
  • Add fragmentation handling the the PacketRx event

RadioEvent.h

    virtual void PacketRx(uint8_t port, uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr, lora::DownlinkControl ctrl, uint8_t slot, uint8_t retries, uint32_t address, bool dupRx) {
        mDotEvent::PacketRx(port, payload, size, rssi, snr, ctrl, slot, retries, address, dupRx);

#if ACTIVE_EXAMPLE == FOTA_EXAMPLE
        if(port == 200 || port == 201 || port == 202) {
            Fota::getInstance()->processCmd(payload, port, size);
        }
#endif
    }

A definition is needed to enable Fragmentation support on mDot and save fragments to flash. This should not be defined for xDot and will result in a compiler error.

mbed_app.json

{
    "macros": [
        "FOTA=1"
    ]
}

The FOTA implementation has a few differences from the LoRaWAN Protocol

  • Fragmentation Indexing starts at 0
  • McKEKey is 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
  • Start Time is a count-down in seconds to start of session

Diff: Fota/MulticastGroup/MulticastGroup.h

Revision:
72:b1e07ec1c30d
Parent:
70:0c5b5b02d17b
diff -r ae3afc16ec3e -r b1e07ec1c30d Fota/MulticastGroup/MulticastGroup.h
--- a/Fota/MulticastGroup/MulticastGroup.h	Fri Nov 08 09:34:58 2019 -0600
+++ b/Fota/MulticastGroup/MulticastGroup.h	Mon Feb 17 14:43:04 2020 -0600
@@ -19,7 +19,7 @@
 #define MULTICASTGROUP_H
 #include "mDot.h"
 #include "mbed.h"
-#define GPS_EPOCH 315986400
+#define GPS_EPOCH 315964800U
 #define MULTICAST_SESSIONS 3
 
 class MulticastGroup {
@@ -31,15 +31,16 @@
         void processCmd(uint8_t* payload, uint8_t size);
         int32_t timeToStart();
         void fixEventQueue();
+        void setClockOffset(int32_t offset);
 
     private:
-        enum McGroup {
-            PACKAGE_VERSION_MC,
+        enum MulticastCommands {
+            PACKAGE_VERSION,
             STATUS,
             SETUP,
             DELETE,
             CLASS_C_SESSION,
-            DATA_BLOCK_AUTH
+            CLASS_B_SESSION_REQ
         };
 
         typedef struct {
@@ -55,6 +56,7 @@
             int32_t class_c_end;
             int32_t class_c_start;
             time_t time_setup;
+            int8_t periodicity;
         } mcgroup;
 
         bool* _filled;
@@ -66,15 +68,17 @@
         uint32_t _freq;
         uint32_t _frame_count;
         time_t _now;
+        int32_t _clk_sync;
 
         mDot* _dot;
         Thread _event_thread;
         EventQueue _switch_class_queue;
         mcgroup _mcGroup[MULTICAST_SESSIONS];
         std::vector<uint8_t>* _ret;
-        std::string _org_class;
+        char _org_class;
 
+        void setupClassB(uint8_t id);
         void setupClassC(uint8_t id);
-        static void switchClass(uint32_t freq, uint8_t dr, std::string newClass);
+        static void switchClass(uint32_t freq, uint8_t dr, char newClass);
 };
 #endif