#!/usr/bin/expect -f
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source "tests/scripts/expect/_common.exp"
source "tests/scripts/expect/_multinode.exp"

setup_two_nodes

# Start CoAP server and set resource contents
switch_node 1
send "coap start\n"
expect_line "Done"
send "coap resource test/resource\n"
expect_line "Done"
send "coap set Testing123\n"
expect_line "Done"
set addr_1 [get_ipaddr mleid]

# Start CoAP client and observe resource
switch_node 2
send "coap start\n"
expect_line "Done"
send "coap observe $addr_1 test/resource\n"
expect_line "Done"
expect "coap response from $addr_1 OBS=0 with payload: 54657374696e67313233" # ASCII of "Testing123"

set addr_2 [get_ipaddr mleid]

# Verify that server creates the subscription
switch_node 1
expect "coap request from $addr_2 GET OBS=0"
expect "Subscribing client"
expect "coap response sent"
send "coap resource\n"
expect "test/resource"
expect_line "Done"
send "coap set\n"
expect "Testing123"
expect_line "Done"

# Server modifies resource several times; client gets notification. The 6th notification is sent as CON,
# to validate the client's interest to keep receiving these notifications.
for {set i 1} {$i <= 9} {incr i} {
    switch_node 1
    send "coap set TestValue2_$i\n"
    expect "sending coap notification to $addr_2"
    expect_line "Done"
    switch_node 2
    expect "coap response from $addr_1 OBS=$i with payload: 5465737456616c7565325f[binary encode hex $i]"
    if {$i == 6} {
        switch_node 1
        expect "Received coap notification ACK from $addr_2"
    }
}

# Client cancels subscription, server removes it.
send "coap cancel\n"
expect_line "Done"
switch_node 1
expect "Removed subscriber $addr_2"

# CoAP client performs CON observe, server sends piggybacked response.
switch_node 2
send "coap observe $addr_1 test/resource con\n"
expect_line "Done"
expect "coap response from $addr_1 OBS=10 with payload: 5465737456616c7565325f39" # value from previous for loop
switch_node 1

# Server sends CON notification, client sends empty Ack.
switch_node 1
send "coap set TestValue3\n"
expect "sending coap notification to $addr_2"
expect_line "Done"
expect "Received coap notification ACK from $addr_2"
switch_node 2
expect "coap response from $addr_1 OBS=11 with payload: 5465737456616c756533"

# Server sends next CON notification, client sends empty Ack.
switch_node 1
send "coap set TestValue4\n"
expect "sending coap notification to $addr_2"
expect_line "Done"
expect "Received coap notification ACK from $addr_2"
switch_node 2
expect "coap response from $addr_1 OBS=12 with payload: 5465737456616c756534"

dispose_all