Austin Blackstone
This is an mbed side application meant to demonstrate how to create a custom GATT service/characteristic with Evothings.
Dependencies: BLE_API mbed nRF51822
Intro
This code is meant to be run on an mbed enabled BLE board and paired with the mbed-evothings-customGATT smartphone application.
Details
This code is a demonstration of how to create a custom service (UUID=0xA0000) with two characteristics, a read only characteristic (UUID=0xA001) and a write characteristic (UUID=0xA002). What is written to the write characteristic will be copied across to the read characteristic and broadcast out. If a single byte is written it will be used to toggle the on board LED, if more than 1 byte is written the data will be written out to the terminal. The default max size is 10bytes.
Viewing Data
You can use either the LightBlue app on iOS or the nRF Master Control Panel application on Android to view the advertising data. Alternatively you can use a custom Evothings App to view the data.
Evothings?
Evothings is a rapid prototyping environment that uses cordova to enable you to rapidly develop smartphone applications in Javascript. Please download the Evothings workbench to your computer and the Evothings client to your smartphone. Then grab the code from the github page, drag and drop the index.htm file into Evothings workbench and run it on the Evothings client.
Reference
Revision 7:f6814152873c, committed 2015-03-09
- Comitter:
- mbedAustin
- Date:
- Mon Mar 09 15:25:43 2015 +0000
- Parent:
- 6:97b22b5bfbb8
- Child:
- 8:60ede963dfe2
- Commit message:
- changed default name to match Evothings Example, added UUID's to braodcast in advertising packet
Changed in this revision
--- a/BLE_API.lib Sat Feb 14 15:49:47 2015 +0000 +++ b/BLE_API.lib Mon Mar 09 15:25:43 2015 +0000 @@ -1,1 +1,1 @@ -http://mbed.org/teams/Bluetooth-Low-Energy/code/BLE_API/#1956023d42fb +http://mbed.org/teams/Bluetooth-Low-Energy/code/BLE_API/#ecbc3405c66e
--- a/main.cpp Sat Feb 14 15:49:47 2015 +0000
+++ b/main.cpp Mon Mar 09 15:25:43 2015 +0000
@@ -9,8 +9,8 @@
// LED object
DigitalOut led(LED1);
-const static char DEVICE_NAME[] = "MyDeviceName"; // change this
-static const uint16_t uuid16_list[] = {0xFF}; //Custom UUID, FF is reserved for development
+const static char DEVICE_NAME[] = "ChangeMe!!"; // change this
+static const uint16_t uuid16_list[] = {0xFFFF}; //Custom UUID, FF is reserved for development
// Set Up Characteristics
static uint8_t readValue[1] = {0x00};
@@ -33,30 +33,34 @@
ble.startAdvertising(); // restart advertising
}
-// This function is called whenever someone writes something to the writeCharacteristic
+// handle writes to writeCharacteristic
void writeCharCallback(const GattCharacteristicWriteCBParams *params)
{
led = params->data[0];
printf("LED Written To, value=%x",params->data[0]);
// TODO: update the readChar value to match write char, or better yet give it an english value
+ // TODO: update with info from here : http://developer.mbed.org/forum/team-63-Bluetooth-Low-Energy-community/topic/5502/
}
int
main(void)
{
- led = 0; // turn LED off
+ led = 1; // turn LED off
ble.init();
ble.onDisconnection(disconnectionCallback);
ble.onDataWritten(writeCharCallback); //TODO: this is not correct, figure out correct syntax
/* setup advertising */
- ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED);
- ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
+ ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE); // BLE only, no classic BT
+ ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED); // advertising type
+ ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME)); // add name
+ ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list)); // UUID's broadcast in advertising packet
ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */
- ble.startAdvertising(); // start advertising
+
ble.addService(customService); // Add our custom service to device
+ ble.startAdvertising(); // start advertising
while (true) {
ble.waitForEvent(); //Save power
}
--- a/mbed.bld Sat Feb 14 15:49:47 2015 +0000 +++ b/mbed.bld Mon Mar 09 15:25:43 2015 +0000 @@ -1,1 +1,1 @@ -http://mbed.org/users/mbed_official/code/mbed/builds/e188a91d3eaa \ No newline at end of file +http://mbed.org/users/mbed_official/code/mbed/builds/7e07b6fb45cf \ No newline at end of file
--- a/nRF51822.lib Sat Feb 14 15:49:47 2015 +0000 +++ b/nRF51822.lib Mon Mar 09 15:25:43 2015 +0000 @@ -1,1 +1,1 @@ -http://mbed.org/teams/Nordic-Semiconductor/code/nRF51822/#0e7a9efee6d7 +http://mbed.org/teams/Nordic-Semiconductor/code/nRF51822/#e95e35845e1c