Mote Mote Radio Communication
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This document discusses radio communication on wireless sensor motes using TinyOS. It describes the message buffer abstraction called message_t that replaces TOS_Msg. It outlines interfaces for basic communication like Packet, Send, and Receiver. It also covers Active Message interfaces like AMPacket and AMSend. Finally, it mentions a demo application called BlinkToRadio that increments a counter, displays its bits on LEDs, and transmits the node ID and value over radio.
Mote Mote Radio Communication
- 1. Mote Mote Radio Communication Intelligent Sensor Network Ankit Singh University of Applied Sciences, Frankfurt am Main Ankit Singh
- 2. Goal: Radio Communication Familiarity with TINYOS interfaces and components Learn How to - message buffer : message_t for tinyOS 2.x - Send a message buffer to the radio - Receive a message buffer from the radio Ankit Singh Mote Mote Radio Communication
- 3. Introduction * All interfaces and components use a common message buffer abstraction, called message_t implemented in nesC struct. * message_t replaces tinyOS 1.x TOS_Msg abstraction Mote Mote Radio Communication Ankit Singh
- 4. Basic Communication Interfaces Packet - Basic Accessor for Message_t abstract type In detail: Clear out the packet: command void clear(message_t* msg); Return the length of the payload: command uint8_t payloadLength(message_t* msg); Set the length field of the packet: command void setPayloadLength(message_t* msg, uint8_t len); Return the maximum payload length: command uint8_t maxPayloadLength(); Return a pointer to a protocol's payload region in a packet: command void* getPayload(message_t* msg, uint8_t len); Mote Mote Radio Communication Ankit Singh
- 5. Basic Communication Interfaces Send - Send a packet with a data payload of len. - provides commands for sending and canceling a pending message send. In Detail: Send packet return SUCCESS, the component will signal sendDone event in the future else will not signal sendDone. command error_t send(message_t* msg, uint8_t len); Cancel a requested transmission command error_t cancel(message_t* msg); Signaled in response to an accepted send request. event void sendDone(message_t* msg, error_t error); Return the maximum payload length that this communication layer can provide. command uint8_t maxPayloadLength(); Mote Mote Radio Communication Ankit Singh
- 6. Basic Communication Interfaces Receiver- Receive a packet buffer, returning a buffer for the signaling component to use for the next reception. Misuse: Most common bugs in TinyOS code. (will show in implementation) The problem: The new message is not being sent out. event message_t* receive(message_t* msg, void* payload, uint8_t len); PacketAcknowledgements - Provides a mechanism for requesting acknowledgements on a per-packet basis. RadioTimeStamping - Provides time stamping information for radio transmission and reception. Provides the time at which start of frame delimiter has been transmitted: units are in terms of a 32kHz clock. Mote Mote Radio Communication Ankit Singh
- 7. Basic Communication Interfaces Receiver- Receive a packet buffer, returning a buffer for the signaling component to use for the next reception. Misuse: Most common bugs in TinyOS code. (will show in implementation) The problem: The new message is not being sent out. event message_t* receive(message_t* msg, void* payload, uint8_t len); PacketAcknowledgements - Provides a mechanism for requesting acknowledgements on a per-packet basis. RadioTimeStamping - Provides time stamping information for radio transmission and reception. Provides the time at which start of frame delimiter has been transmitted: units are in terms of a 32kHz clock. Mote Mote Radio Communication Ankit Singh
- 8. Basic Communication Interfaces Active Message Interfaces: AMPacket - Similar to Packet, provides the basic AM accessors for the message_t abstract data type. This interface provides commands for getting a node's AM address, an AM packet's destination, and an AM packet's type. Commands are also provides for setting an AM packet's destination and type, and checking whether the destination is the local node. AMSend - Similar to Send, provides the basic Active Message sending interface. The key difference between AMSend and Send is that AMSend takes a destination AM address in its send command. Mote Mote Radio Communication Ankit Singh
- 9. DEMO: BlinkToRadio Application Objective: i) Incrementing a counter ii) Displaying the three lowest bits of the counter on the LED's iii) Transmitting the node's id and counter value over the radio Now, let's move to the console and run the Demo!!! Mote Mote Radio Communication Ankit Singh
- 10. DEMO: BlinkToRadio Application Objective: i) Incrementing a counter ii) Displaying the three lowest bits of the counter on the LED's iii) Transmitting the node's id and counter value over the radio Now, let's move to the console and run the Demo!!! Mote Mote Radio Communication Ankit Singh