OT_WEAK void dll_beacon_applet(m2session* active) {
/// Beaconing is a Request-TX operation, and the value for Tc is the amount of
/// time to spend in CSMA before quitting the beacon.
ot_queue beacon_queue;
ot_u8 b_params;
ot_u8 cmd_ext;
ot_u8 cmd_code;
b_params = active->extra;
active->extra = 0;
/// Start building the beacon packet:
/// <LI> Calling m2np_header() will write most of the front of the frame </LI>
/// <LI> Add the command byte and optional command-extension byte </LI>
m2np_header(active, M2RT_BROADCAST, M2FI_FRDIALOG);
cmd_ext = (b_params & 0x06); // Normal extension bits
cmd_ext |= (dll.netconf.btemp[2] == 0) << 6; // Announcement No-File bit
cmd_code = 0x20 | (b_params & 1) | ((cmd_ext!=0) << 7);
q_writebyte(&txq, cmd_code);
if (cmd_code) {
q_writebyte(&txq, cmd_ext);
}
/// Setup the comm parameters, if the channel is available:
/// <LI> dll.comm values tx_eirp, cs_rssi, and cca_rssi must be set by the
/// radio module during the CSMA-CA process -- don't set them here.
/// The DASH7 spec requires it to happen in this order. </LI>
/// <LI> Set CSMA-CA parameters, which are used by the radio module </LI>
/// <LI> Set number of redundant TX's we would like to transmit </LI>
/// <LI> Set rx_timeout for Default-Tg or 0, if beacon has no response </LI>
dll_set_defaults(active);
dll.comm.tc = TI2CLK(M2_PARAM_BEACON_TCA);
dll.comm.rx_timeout = (b_params & 0x02) ? \
0 : rm2_default_tgd(active->channel);
dll.comm.csmaca_params |= (b_params & 0x04) | M2_CSMACA_NA2P | M2_CSMACA_MACCA;
dll.comm.redundants = dll.netconf.b_attempts;
q_writebyte(&txq, (ot_u8)dll.comm.rx_timeout);
/// Add the announcement file data if the specified return data != 0 bytes.
/// If the beacon data is missing or otherwise not accessible by the GUEST
/// user, dump the session (thus killing the beacon) and go back to idle.
if (dll.netconf.btemp[2] != 0) {
q_init(&beacon_queue, &dll.netconf.btemp[2], 4);
if (m2qp_isf_call((b_params & 1), &beacon_queue, AUTH_GUEST) < 0) {
session_pop();
dll_idle();
return;
}
}
/// Final step to any packet generation: add footer
m2np_footer();
}
OT_WEAK ot_u16 otapi_open_request(addr_type addr, routing_tmpl* routing) {
/// Set the header if the session is valid. Also conditionally write the header
/// depending on the address type (a parameter).
if (session_notempty()) {
m2session* s_active;
s_active = session_top();
// Set the dll parameters to a safe setting; can be changed later
dll_set_defaults(s_active);
// Unicast/Anycast support routing, so copy the supplied template
if ((addr & M2QUERY_GLOBAL) == 0) {
platform_memcpy((ot_u8*)&m2np.rt, (ot_u8*)routing, sizeof(routing_tmpl));
}
// Load the header
m2np_header(s_active, (ot_u8)addr, M2FI_FRDIALOG);
return 1;
}
return 0;
}
ot_int sub_parse_request(m2session* session) {
ot_int score = 0;
ot_u8 cmd_opcode;
//ot_u8 nack = 0;
/// 1. Universal Comm Processing <BR>
/// - Load CCA type & CSMA disable from command extension <BR>
/// - Load NA2P or A2P dialog type from command code
m2qp.cmd.code = q_readbyte(&rxq);
m2qp.cmd.ext = (m2qp.cmd.code & 0x80) ? q_readbyte(&rxq) : 0;
dll.comm.csmaca_params = m2qp.cmd.ext & (M2_CSMACA_CAMASK | M2_CSMACA_NOCSMA);
dll.comm.csmaca_params |= m2qp.cmd.code & M2_CSMACA_ARBMASK;
cmd_opcode = m2qp.cmd.code & M2OP_MASK;
/// 2. All Requests contain the dialog template, so load it. <BR>
/// - [ num resp channels ] [ list of resp channels] <BR>
/// - if number of resp channels is 0, use the current channel
{
ot_u8 timeout_code = q_readbyte(&rxq);
dll.comm.rx_timeout = otutils_calc_timeout(timeout_code); // original contention period
dll.comm.tc = dll.comm.rx_timeout; // contention period counter
if (timeout_code & 0x80) {
dll.comm.tx_channels = q_readbyte(&rxq);
dll.comm.tx_chanlist = q_markbyte(&rxq, dll.comm.tx_channels);
}
else {
dll.comm.tx_channels = 1;
dll.comm.tx_chanlist = &dll.comm.scratch[0];
dll.comm.scratch[0] = session->channel;
}
}
/// 3. Handle Command Queries (filtering) <BR>
/// Multicast and anycast addressed requests include queries
if (m2np.header.addr_ctl & 0x80) {
score = sub_process_query(session);
}
/// 4. If the query is good (sometimes this is trivial): <BR>
/// - Prepare the response header (same for all responses) <BR>
/// - Run command-specific dialog data processing
if (score >= 0) {
q_empty(&txq); // Flush TX Queue
if (m2qp.cmd.ext & M2CE_NORESP) {
session->netstate |= M2_NETFLAG_SCRAP;
}
else {
ot_u8 addressing;
session->netstate &= ~M2_NETSTATE_TMASK;
session->netstate |= M2_NETSTATE_RESPTX;
addressing = ext_get_m2appflags();
addressing |= m2np.header.addr_ctl & 0x30; // make unicast, retain VID & NLS
m2np_header(session, addressing, 0); // Create M2QP header
q_writebyte(&txq, (M2TT_RESPONSE | cmd_opcode)); // Write Cmd code byte
}
switch ((cmd_opcode>>1) & 7) {
case 0:
case 1:
break;
case 2:
sub_opgroup_shell();
break;
case 3:
case 4:
sub_opgroup_collection();
break;
case 5:
break;
case 6:
sub_opgroup_datastream();
break;
case 7:
sub_ack_datastream();
break;
}
}
