Fix udprpc task ID (oxidecomputer#1046)

Previously, `udprpc` assumed the target task was at generation 0.

This also adds `udprpc` and `udpbroadcast` to the Gimletlet image, and removes a
vestigal constant.

app/gimletlet/app.toml

@@ -160,7 +160,7 @@ task-slots = ["sys"]
 
 [tasks.net]
 name = "task-net"
-stacksize = 3800
+stacksize = 6040
 priority = 3
 features = ["h753", "vlan", "gimletlet-nic"]
 max-sizes = {flash = 131072, ram = 32768, sram1 = 16384}
@@ -170,6 +170,15 @@ start = true
 interrupts = {"eth.irq" = 0b1, "tim16.irq" = 0b10}
 task-slots = ["sys", "spi_driver" ]
 
+[tasks.udprpc]
+name = "task-udprpc"
+priority = 6
+max-sizes = {flash = 32768, ram = 8192}
+stacksize = 4096
+start = true
+task-slots = ["net"]
+features = ["vlan"]
+
 [tasks.udpecho]
 name = "task-udpecho"
 priority = 4
@@ -179,6 +188,15 @@ start = true
 task-slots = ["net"]
 features = ["vlan"]
 
+[tasks.udpbroadcast]
+name = "task-udpbroadcast"
+priority = 6
+max-sizes = {flash = 16384, ram = 8192}
+stacksize = 4096
+start = true
+task-slots = ["net"]
+features = ["vlan"]
+
 [tasks.control_plane_agent]
 name = "task-control-plane-agent"
 priority = 7
@@ -323,13 +341,27 @@ cs = [{port = "E", pin = 11}]
 [config.net]
 vlan = { start = 0x301, count = 2 }
 
+[config.net.sockets.broadcast]
+kind = "udp"
+owner = {name = "udpbroadcast", notification = 1}
+port = 997
+tx = { packets = 3, bytes = 1024 }
+rx = { packets = 3, bytes = 1024 }
+
 [config.net.sockets.echo]
 kind = "udp"
 owner = {name = "udpecho", notification = 1}
 port = 7
 tx = { packets = 3, bytes = 1024 }
 rx = { packets = 3, bytes = 1024 }
 
+[config.net.sockets.rpc]
+kind = "udp"
+owner = {name = "udprpc", notification = 1}
+port = 998
+tx = { packets = 3, bytes = 1024 }
+rx = { packets = 3, bytes = 1024 }
+
 [config.net.sockets.control_plane_agent]
 kind = "udp"
 owner = {name = "control_plane_agent", notification = 0b01}

task/udprpc/src/main.rs

@@ -102,8 +102,11 @@ fn main() -> ! {
                         // u32 return code from the `sys_send` call.
                         let tx_data =
                             &mut tx_data_buf[REPLY_PREFIX_SIZE..][..nreply];
+
+                        let task_id =
+                            sys_refresh_task_id(TaskId(header.task.get()));
                         let (rc, len) = sys_send(
-                            TaskId(header.task.get()),
+                            task_id,
                             header.op.get(),
                             rx_data,
                             tx_data,